Breedlove: May 2011

Sunday 15 May 2011

mysql - HTTP Request 500 when I call mysqli_connect with PHP -

i want utilize database store user data. running apache server php , mysql installed. when seek mysqli_connect, there http 500 error. code:

$con = mysqli_connect("localhost","root","password","database"); mysqli_close($con);

i checked apache log; here's said:

[time] [error] [client localhost] php fatal error: phone call undefined function mysqli_connect() in [document address] on line 78, referer: [url]

and

php warning:  php startup: unable load dynamic library 'ext/php_mysqli.dll' - specified module not found.\r\n in unknown on line 0

also, var_dump(function_exists('mysqli_connect')); outputs bool(false).

i've uncommented extension=php_mysqli.dll in php.ini, checked ext directory , there php_mysqli.dll file in it, checked other stackoverflow (and other) questions this, none of answered me. reply staring @ me in face? new this.

test phpinfo () , create sure function activated

php mysql apache internal-server-error

c# - can't see some cs files while Getting Latest Version from TFS -

i'm using tfs source control, seek latest version, .cs files missing in visual studio, when open folder project these files there can't see in solution explorer whats problem?

sounds you've run in merge issue, files can in source , retrieved without beingness refrenced in proj file.

there button on top of solution explorer, right of minimize all, looks 1 document behind another. if click show files in directory. can right-click , add together on each file want

How safe is cross domain access? -

i working on personal project , have beingness considering security of sensitive data. want utilize api accessing backend , want maintain backend in different server 1 user logon to. require cross domain accessing of data.

considering lot of accessing , transaction done, have next questions help guide me in right path have tried , tested cross domain access. don't want assume , implement , run troubles , redesign when have launched service thereby losing sleep. know there no right way many things in programming there many wrong ways.

how safe in handling sensitive info (even https). does have issues handling lot of users transactions. does have downside not mentioned.

these questions asked because post have read eve discouraged utilize of cross-domain access while encouraged it. decided hear professionals have used in bigger scale.

i building mobile app, using laravel backend.

thanks..

how safe in handling sensitive info (even https).

ssl considered safe (it's used everywhere , considered standard). however, it's not less safe hitting different server. info still has traverse pipes , reach destination has same risks regardless of server.

does have issues handling lot of users transactions.

i don't see why would. server server. ultimately, server's ability handle volume transactions going based on power, efficiency of code, , application's ability scale.

does have downside not mentioned.

authentication thing comes mind. i'm confused question how log 1 access info another. seems 1 application. if want revise question, i'll update answer.

cross-domain

.net - How to implement default methods for an interface? -

when creating new class in .net if declare "implements idisposable" , nail enter, see visual studio adds itselt differents methods , functions filled class. when seek interfaces, creates empty methods , functions.

is there way provide default implementations of methods , functions ?

i have been looking link didn't resolve issue.

example of implementation i'm looking :

#region "idisposable support"     private disposedvalue boolean '  observe redundant calls      ' idisposable     protected overridable sub dispose(byval disposing boolean)         if not me.disposedvalue             if disposing                 ' todo: dispose managed state (managed objects).             end if              ' todo: free unmanaged resources (unmanaged objects) , override finalize() below.             ' todo: set  big fields null.         end if         me.disposedvalue = true     end sub      ' todo: override finalize() if dispose(byval disposing boolean) above has code free unmanaged resources.     'protected overrides sub finalize()     '    ' not  alter code.   set cleanup code in dispose(byval disposing boolean) above.     '    dispose(false)     '    mybase.finalize()     'end sub      ' code added visual basic correctly implement disposable pattern.     public sub dispose() implements idisposable.dispose         ' not  alter code.   set cleanup code in dispose(byval disposing boolean) above.         dispose(true)         gc.suppressfinalize(me)     end sub #end  part

cheers in advance.

further exaplanations of i'm looking :

let's assume next interface

here happens , i'm looking :

it knows how set basic idisposable implementation, there's mutual pattern should follow.

but how perchance know how implement interfaces? empty methods need fill in yourself.

your closest bet set snippet , insert rather letting visual studio adding unimplemented members.

.net vb.net visual-studio interface

html - PHP 'loop for' with input text form -

i'm doing programme have insert number ("x"), , generate "x" number of "input forms" come in diferent numbers later, calculate operations.

i have generate forms using for, , then, pass results submit button $_post next page. then, when seek results for, doesn't works , problems.

notice: undefined variable: num4 in...

what doing wrong?

thank you!

<?php /*here number create "x" number of forms*/  if (isset($_post["num"])) {    $num=$_post["num"]; $_post["num"]=$num;          if ( is_numeric($num) , $num>=0)         {            echo"<form action=\"tercera.php\" method=\"post\">";              echo "quina operació vols fer?:<br><br> "                 . "<input type=\"radio\" name=\"operacio\" value=\"suma\"/>suma "                 . "<input type=\"radio\" name=\"operacio\" value=\"mitja\"/>mitja"                 . "<input type=\"radio\" name=\"operacio\" value=\"major\"/>major"                 . "<input type=\"radio\" name=\"operacio\" value=\"menor\"/>menor</p>";   /*here  create loop generate forms "numero[$i]" */              ($i=1; $i<=$num; $i++)             {                echo" <input type=\'text\' name=\'numero[$i]\' maxlength=\'10\' size=\"10\"/>";               }             echo "<p><input type='submit' value='calcula' /></p>";                        }         else         {             echo "<h3>has d'escriure  united nations numero mes gran que 0, torna-ho intentar.";         } }//isset*/  ?>  /*/ next  php page /*/  <?php  if (isset($_post["operacio"])) $operacio=$_post["operacio"];  //here numbers of  lastly page     ($i=1; $i<=2; $i++)    {        if (isset($_post["numero[$i]"])) $num2=$_post["numero[$i]"] ;   //here error: undefined variable: num2            echo $num2;            }   //this part ok ...          if ($operacio == "suma")          {             echo "i equals 0";         }          elseif ($operacio == "mitja")          {             echo "i equals 1";         }         elseif ($operacio == "major")          {             echo "i equals 2";         }          elseif ($operacio == "menor")          {             echo "i equals 3";         }           if ( is_numeric($num) , $num>=0)         {              ($i=1; $i<=$num; $i++)             {               }          }         else         {             echo "<h3>has d'escriure  united nations numero mes gran que 0, torna-ho intentar.";         } //isset*/  ?>

in sec page don't utilize this:

if (isset($_post["numero[$i]"])) $num2=$_post["numero[$i]"];

because field doesn't exist. when utilize array of fields, need field, , after position, instance, work:

if(isset($_post["numero"]) && isset($_post["numero"][$i])) $num2=$_post["numero"][$i];

remember, using field array.

if don't want in troubles elements in array, utilize (after knowing $_post["numero] exists):

foreach($_post["numero"] $num) { echo $num; // or waht want do. }

i hope help you.

php html forms

arrays - PHP IF ELSE condition and Foreach -

i have little issue trying compare info 3 arrays, 1 of them source , other 2 conditions.

the scenario next:

$array1 = array('code' => '123', 'code' => '124', 'code' => '125', 'code' => '126', 'code' => '127'); $array2 = array(     array('code1' => '123', 'country' => 'us', 'listed' => '0'),      array('code1' => '124', 'country' => 'us', 'listed' => '1'),     array('code1' => '125', 'country' => 'us', 'listed' => '1') ); $array3 = array(     array('code2' => '123', 'country' => 'us', 'listed' => '1'),     array('code2' => '126', 'country' => 'us', 'listed' => '0'),     array('code2' => '127', 'country' => 'us', 'listed' => '1') );  $final = array_merge($array1,$array2,$array3);  foreach ($final $f) {     if ($f['code'] == $f['code1']) {         if ($f['listed'] > 0) {             $finallisted = $f['listed'];         }     } elseif ($f['code'] == $f['code2']) {         if ($f['listed'] > 0) {             $finallisted = $f['listed'];         }     }      $newfinalarray = array(         'code' = $finalcode,         'listed' = $finallisted,         'country' = $finalcountry     ); }

so need check first if code $array1 exist in $array2 , if if code $array2 listed if not check on $array3 , on.

so if code exist on $array2 , listed 1 update database values if not check $array3 if exist , listed 1 update values if not update values $array2

the thought $array2 1 site , $array3 another, so, if not in 1 sec if in both keek $array2

the problem cannot sort, have tried array_combine combines 2 arrays , parameters need exactly. array merge 3 arrays one, on foreach , on apply if conditions variable undefined.

first of see lots of issue in way arrays declared you

ex -

$array1 = array('code' = > '123', 'code' = > '124', 'code' = > '125', 'code' = > '126', 'code' = > '127');

is nil but

$array1 = array('code' => '127'); //because of same index consider lastly value

however have modified arrays , tried prepare solution might useful you. check 1 time below.

<?php $array1 = array('123', '124', '125', '126', '127'); $array2 = array(array('code' => '123', 'country' => 'us', 'listed' => '0'),     array('code' => '124', 'country' => 'us', 'listed' => '1'), array('code' => '125', 'country' => 'us', 'listed' => '1')); $array3 = array(array('code' => '123', 'country' => 'us', 'listed' => '1'), array('code' => '126', 'country' => 'us', 'listed' => '0'), array('code' => '127', 'country' => 'us', 'listed' => '1'));  function comparesitesandupdate($array1, $array2, $array3) {     foreach($array1 $code) {     if(iscodeexistsinarray($code,$array2)) {        echo $code . ' in array2 , listed <br />';     }     else { // ;( not in array2 check in array3       echo $code . ' not listed in array2 - checking in array3 <br />';       if(iscodeexistsinarray($code,$array3)) {          echo $code . ' in array3 , listed <br />';       }       else {         echo $code . ' not listed in array3 - whatever want <br />';       }     }      } }  //note $earray expected in format of $array2/$array3 //and key of $array2 , $array3 should 'code' - not necessary  alter keys 2 diff arrays function iscodeexistsinarray($ecode, $earray) {     foreach($earray $code_array) {     if($ecode == $code_array['code']) { //code match found - check if listed        if($code_array['listed'] == 1) { //got need -  homecoming true , break          homecoming true;        }         }     }       homecoming false; //any other case  homecoming false; }  comparesitesandupdate($array1, $array2, $array3); ?>

php arrays

java - Unable to connect to mysql jdbc database -

i frustrated seeing error , not knowing solution. trying connect mysql db server url giving mysqlexception(stacktrace below). code works fine till here:

string dburl = "jdbc:mysql://server_url/db_name"; string driver = "com.mysql.jdbc.driver"; class.forname(driver).newinstance(); string user = "user"; string password = "password"; conn = drivermanager.getconnection(dburl,user,password);

this error i'm getting

java.sql.sqlexception: null,  message server: "host '172.23.251.154' not allowed connect mysql server"     @ com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:946)     @ com.mysql.jdbc.mysqlio.dohandshake(mysqlio.java:1070)     @ com.mysql.jdbc.connection.createnewio(connection.java:2775)     @ com.mysql.jdbc.connection.<init>(connection.java:1555)     @ com.mysql.jdbc.nonregisteringdriver.connect(nonregisteringdriver.java:285)     @ java.sql.drivermanager.getconnection(drivermanager.java:582)     @ java.sql.drivermanager.getconnection(drivermanager.java:185)

is because i'm using different version of mysql-connector jar? please help me.

from chapter 6. sql questions: how enable tcp connections mysql?,

by default, mysql won't allow users access of databases if connect on tcp connection. in order permit connection, must create entry in user table of mysql database (make sure select password function encrypt password). in particular, host field needs indicate host(s) permitted connect. if specify % (which not recommend), user able connect host.

java mysql database jdbc

pharo - SmallTalk - Printing contents of an OrderedCollection object using Transcript -

|oc| oc := orderedcollection new. oc add: 2. oc add: #(4 9). oc transcript show: self; cr.

upon running next code in pharo, getting message:

messagenotunderstood: orderedcollection>> transcript

when replacing 'self' 'oc' still getting same error. looking way output collection using transcript.

why can't transcript receiver of code?

remember object message: parameter syntax: you're trying send transcript message oc object, , send show: message object returned that, self parameter.

what want inquire transcript object show: oc object. so, that: send transcript show: message oc parameter: transcript show: oc. show string representation of collection.

if print each fellow member of collection (instead of printing the collection itself), should utilize do: method iterate on them: oc do: [ :element | transcript show: element ]. here print each of collection's member string representation.

oc := orderedcollection new.  oc add: 2. oc add: #(4 9). transcript show: 'show collection:'; cr. transcript show: oc; cr. transcript show: 'show each element:'; cr. oc do: [ :element | transcript show: element; cr ].

gives output:

show collection: orderedcollection(2 #(4 9)) show each element: 2 #(4 9)

smalltalk pharo

php - get city from ip not working on remote server -

get city ip not working on remote server works in localhost. have improve ideas getting city class? server remote addr displays this:

::1

here code i'm using:

class iplocation{    public function ipgetcity(){      $ip=$_server['remote_addr'];     $addr_details = unserialize(file_get_contents('http://www.geoplugin.net/php.gp?ip=&#8217',$ip));     $city = stripslashes(ucfirst($addr_details['geoplugin_city']));      homecoming $city; } }

php get city

python - Raise Error when form has punctuation django -

i need way raise error when submit punctuation in title. im beginner im not quite sure how so. form:

class neededform(forms.modelform):     title = forms.charfield(max_length=120)     likes = forms.integerfield(widget=forms.hiddeninput(), initial=0)     body = forms.charfield(min_length=50,widget = forms.textarea)     captcha = captchafield()      def clean_title(self):           info = self.cleaned_data['title']          homecoming   info     class meta:         model = needed         fields = ('title', 'body', 'likes')

the view:

def detail(request, needed_title_url):     context = requestcontext(request)      needed_name = needed_title_url.replace('_', ' ')     context_dict = {'needed_name': needed_name}     try:         needed = needed.objects.get(title=needed_name)         context_dict['needed'] = needed         print "true!"     except:         pass       homecoming render_to_response('needed.html', context_dict, context)

if user inputs like: i chicken! title need show user error.

i'm not totally sure question, looks reply looking may included in https://docs.djangoproject.com/en/1.6/ref/models/fields/#slugfield

the slugfield charfield can contain letters, numbers, underscores , hyphens (so understands max_length,...)

class neededform(forms.modelform):     title = forms.slugfield(max_length=120)     likes = forms.integerfield(widget=forms.hiddeninput(), initial=0)     body = forms.charfield(min_length=50,widget = forms.textarea)     captcha = captchafield()

i looking more complicated rule checking, have validator page https://docs.djangoproject.com/en/1.6/ref/validators/ , how utilize in form https://docs.djangoproject.com/en/1.6/ref/forms/validation/#using-validators illustration provided explaining slugfield implementation.

hope helps !

python django django-forms

android interval between sensor listeners -

i wrote simple android code, listens acceleration , orientation sensors, , writes acceleration x,y,z values, , angel north.

in app trying set 30 seconds interval between sending sensors event onsensorchanged() function, it's still updating few times every second.

this code:

package com.example.sensors;  import java.util.list;  import android.os.bundle; import android.util.log; import android.view.menu; import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.app.activity; import android.hardware.sensor; import android.hardware.sensorevent;  public class mainactivity extends activity implements sensoreventlistener{       private sensormanager sensormanager;        @override        protected void oncreate(bundle savedinstancestate) {           super.oncreate(savedinstancestate);           setcontentview(r.layout.activity_main);           sensormanager = (sensormanager)this.getsystemservice(sensor_service);     }         @override        public boolean oncreateoptionsmenu(menu menu) {           // inflate menu; adds items action bar if present.           getmenuinflater().inflate(r.menu.main, menu);            homecoming true;        }         @override        public void onsensorchanged(sensorevent event) {              if (event.sensor.gettype() == sensor.type_accelerometer) //              {                  float x = event.values[0];                  float y = event.values[1];                  float z = event.values[2];                  log.i("acceleration:", "x, y, z" + " " + x + " " + y + " " + z + " ");                }                             else if (event.sensor.gettype() == sensor.type_orientation) //@deprecated.  utilize type_magnetic_field              {                  log.i("orentation: " , "north:" + event.values[0]);              }          }           @override          public void onaccuracychanged(sensor sensor, int accuracy) {           }           @override          protected void onresume() {            super.onresume();            // register class listener accelerometer sensors , orientation            sensormanager.registerlistener(this,                sensormanager.getdefaultsensor(sensor.type_accelerometer),//this method default sensor given type                30000000);//sensormanager.sensor_delay_normal            sensormanager.registerlistener(this,                    sensormanager.getdefaultsensor(sensor.type_orientation),//this method default sensor given type                    30000000);           }           @override          protected void onpause() {            // unregister listener            super.onpause();            sensormanager.unregisterlistener(this);          }  }

you can't set custom interval sensor rates. slowest rate possible sensor_delay_ui, , samples per sec depend on device. need filter these values saving lastly time printed values, wait until difference between time , current time on 30 seconds , print again.

android sensor

PSNR calclator of 2 YUV files using c++ segmentation fault -

iam trying write code in c++ calculate psnr of 2 yuv video files should work segmentation fault error .. help here highly appreciated here code

#include <math.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "base.h"   void makeaframe( yuvframe* f, int width, int height ) {  f->lum.width = width;    f->lum.height  = height;       f->cb .width = width/2;  f->cb .height  = height/2;      f->cr .width = width/2;  f->cr .height  = height/2;    }  void readcolorcomponent( colorcomponent* cc, file* file ) {  unsigned int size   = cc->width*cc->height;  unsigned int rsize;   rsize = fread( cc->data, sizeof(unsigned char), size, file );   }  double psnr( colorcomponent& rec, colorcomponent& org) {  unsigned char*  porg  = org.data;  unsigned char*  prec  = rec.data;  double          ssd   = 0;  int             diff;    ( int r = 0; r < rec.height; r++ )  {    for( int c = 0; c < rec.width;  c++ )    {      diff  = prec[c] - porg[c];      ssd  += (double)( diff * diff );    }    prec   += rec.width;    porg   += org.width;  }   if( ssd == 0.0 )  {     homecoming 99.99;  }   homecoming ( 10.0 * log10( (double)rec.width * (double)rec.height * 65025.0 / ssd ) ); }  void getpsnr( double& psnry, double& psnru, double& psnrv, yuvframe& rcframeorg, yuvframe& rcframerec ) {  psnry = psnr( rcframerec.lum, rcframeorg.lum );  psnru = psnr( rcframerec.cb,  rcframeorg.cb  );  psnrv = psnr( rcframerec.cr,  rcframeorg.cr  ); }  void readframe( yuvframe* f, file* file ) {  readcolorcomponent( &f->lum, file );  readcolorcomponent( &f->cb,  file );  readcolorcomponent( &f->cr,  file ); }   int main(int argc, char *argv[]) {  int     acc = 10000;  #define   out "%d,%04d"  int           stream          = 0;  unsigned int  width           = 0;  unsigned int  height          = 0;  unsigned int  temporal_stages = 0;  unsigned int  skip_at_start   = 0;  double        fps             = 0.0;  file*         org_file        = 0;  file*         rec_file        = 0;  file*         str_file        = 0;  char*         prefix_string   = 0;  unsigned int  index, skip, skip_between, sequence_length;  int           py, pu, pv, br;  double        bitrate = 0.0;  double        psnry, psnru, psnrv;  yuvframe      corgframe, crecframe;  double        averagepsnr_y = 0.0;  double        averagepsnr_u = 0.0;  double        averagepsnr_v = 0.0;  int                  currarg = 5;  int                  rpsnr   = 0;  width             = 300;   height            = 240;  org_file          = fopen("foreman_qcif.yuv","rb");   rec_file          = fopen("foreman_qcif2.yuv","rb");   temporal_stages=2;  fseek(    rec_file, 0, seek_end );  fseek(    org_file, 0, seek_end );  size_t rsize = ftell( rec_file );  size_t osize = ftell( org_file );  fseek(    rec_file, 0, seek_set );  fseek(    org_file, 0, seek_set );   if (rsize < osize)  {    sequence_length = (unsigned int)((double)rsize/(double)((width*height*3)/2));  }   else   {    sequence_length = (unsigned int)((double)osize/(double)((width*height*3)/2));   skip_between    = ( 1 << temporal_stages ) - 1;  }  //here  seek  create frames out of images  makeaframe( &corgframe, width, height );  makeaframe( &crecframe, width, height );   //looping on frames   for( skip = skip_at_start, index = 0; index < sequence_length; index++, skip = skip_between )  {    fseek( org_file, skip*width*height*3/2, seek_cur);     readframe       ( &corgframe, org_file );    readframe       ( &crecframe, rec_file );     getpsnr         ( psnry, psnru, psnrv, corgframe, crecframe);    averagepsnr_y +=  psnry;    averagepsnr_u +=  psnru;    averagepsnr_v +=  psnrv;     py = (int)floor( acc * psnry + 0.5 );    pu = (int)floor( acc * psnru + 0.5 );    pv = (int)floor( acc * psnrv + 0.5 );    fprintf(stdout,"%d\t"out"\t"out"\t"out"\n",index,py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);  }  fprintf(stdout,"\n");   py = (int)floor( acc * averagepsnr_y / (double)sequence_length + 0.5 );  pu = (int)floor( acc * averagepsnr_u / (double)sequence_length + 0.5 );  pv = (int)floor( acc * averagepsnr_v / (double)sequence_length + 0.5 );  br = (int)floor( acc * bitrate                                 + 0.5 );  if( stream )  {    if( prefix_string )    {      fprintf(stderr,"%s\t"out"\t"out"\t"out"\t"out"\n",prefix_string,br/acc,br%acc,py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);      fprintf(stdout,"%s\t"out"\t"out"\t"out"\t"out"\n",prefix_string,br/acc,br%acc,py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);    }    else    {      fprintf(stderr,out"\t"out"\t"out"\t"out"\n",br/acc,br%acc,py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);      fprintf(stdout,out"\t"out"\t"out"\t"out"\n",br/acc,br%acc,py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);    }  }  else  {    fprintf(stderr,"total\t"out"\t"out"\t"out"\n",py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);    fprintf(stdout,"total\t"out"\t"out"\t"out"\n",py/acc,py%acc,pu/acc,pu%acc,pv/acc,pv%acc);  }   fprintf(stdout, "\n");  fclose     ( org_file   );  fclose     ( rec_file   );  if( stream )  {    fclose   ( str_file   );  }    homecoming (rpsnr*py); }

and base.h contains structures

typedef struct {  int             width;  int             height;  unsigned char*  data; } colorcomponent;  typedef struct {  colorcomponent lum;  colorcomponent cb;  colorcomponent cr; } yuvframe;

well, segmentation error arises trying access memory addresses not assigned ... w hot-fix avoid error add together function code

void foo( colorcomponent* cc ) {  if( ! ( cc->data = new unsigned char[cc->width * cc->height]))  {    fprintf(stderr, "\nerror: memory allocation failed!\n\n");    exit(-1);  } }

and alter these lines

void makeaframe( yuvframe* f, int width, int height ) {  f->lum.width = width;    f->lum.height  = height;       f->cb .width = width/2;  f->cb .height  = height/2;      f->cr .width = width/2;  f->cr .height  = height/2;    }

void makeaframe( yuvframe* f, int width, int height ) {  f->lum.width = width;    f->lum.height  = height;      foo( &f->lum );  f->cb .width = width/2;  f->cb .height  = height/2;  foo( &f->cb  );  f->cr .width = width/2;  f->cr .height  = height/2;     foo( &f->cr  ); }

things should work now

c++

algorithm - Trapez Method in Java -

i found formula in net calculating trapezoid method , works should, not see why should performed next lines in trapez method:

sum = 0.5 * bef + (h * sum); i= i+ 2

the first iteration performed next command in main :

tra[0] = 0.5 * ((b - a) / n) * (function(a) + function(b)); //calculates first step value

the trapez method next iterations:

/**  * calculate next step trapez method  * @param -lower limit  * @param b -upper limit  * @param bef -previous step value  * @param n -number of dividing points  * @return integral area  */ public static double trapz(double a, double b,double bef, int n) {     double sum = 0;     double h = ((b - a)/n);     (int = 1; <= n; = + 2) {         sum += function(a + (i) * h);     }     sum = 0.5 * bef + (h * sum);      homecoming sum; }

the function used in conjunction driver loop doubles number of subintervals @ each iteration, refining estimated integral until difference 1 iteration next less threshold criterion. desirable in such endeavor avoid repeating computations have been performed, , that's point of lines asked about.

consider function values needed when applying trapezoid rule on given number of subintervals. consider function values needed splitting each subinterval in half , applying trapezoid rule subintervals. half (give or take 1) of function values needed in latter case same ones needed in former. code presented reuses computed values (0.5 * bef), adding them new values (i = + 2). must scale downwards previous estimate factor of 2 business relationship splitting subintervals in two.

note code right, appears argument n must represent number of subintervals of integration region, not number of dividing points documentation claims.

java algorithm math integral

java - Cp command android from assets folder -

i want know if it's possible execute "cp" linux command re-create file assets folder of app /system/bin partition (obviously root access).

utility.exec("cp <file:///android_asset/my_file> /system/bin");

this code valid re-create files assets system/bin?

here clean example, assuming root acquired :

assetmanager assetmanager = context.getassets();  inputstream = null; outputstream os = null;  seek {     = assetmanager.open("my_file");     os = new fileoutputstream("/system/bin/my_file");      byte[] buffer = new byte[1024];     int length;      //  re-create file content in bytes      while ((length = is.read(buffer)) > 0)     {         os.write(buffer, 0, length);     } }  grab (exception e) {     // dealing exception, log or } {     if (is != null)  seek { is.close(); }  grab (ioexception e) {}     if (os != null)  seek { os.close(); }  grab (ioexception e) {} }

java android linux

jboss - Wildfly 8, mod_cluster & apache integration -

i having problems getting mod_cluster 1.2 work apache. want configuration allow apache proxy traffic apps server myserver.com:9191 (apache) routes traffic myserver.com:9090 (jboss)

symptoms:

when start wildfly console produces next error every 3-5 seconds:

error [org.jboss.modcluster] (undertoweventhandleradapter - 1) modcluster000042: error null sending info command precise32/127.0.1.1:6666, configuration reset: null

i can see corresponding request in apache logs as: "info / http/1.1" 501 529 "-" "clusterlistener/1.0"

the myserver:9191/mod_cluster-manager url shows page title , links, no cluster info, this: mod_cluster/1.2.6.final

auto refresh show dump output show info output

i running both jboss , apache on same virtual server.

server info:

virtual box 4.3.14 running:

ubuntu 12.04 lts

apache/2.2.22

wildfly 8.0

i can navigate web apps on wildfly straight without going through apache , works fine. if seek , navigate through apache, next errors in apache log:

[thu oct 16 03:12:33 2014] [debug] mod_proxy_cluster.c(2231): proxy: byrequests balancer failed

[thu oct 16 03:12:33 2014] [error] proxy: cluster: (balancer://mycluster). workers in error state

[thu oct 16 03:12:33 2014] [debug] mod_deflate.c(615): [client 10.0.2.2] zlib: compressed 410 276 : url /

my relevant apache configs like:

mod_cluster.load:

loadmodule proxy_module /usr/lib/apache2/modules/mod_proxy.so

loadmodule advertise_module /usr/lib/apache2/modules/mod_advertise.so

loadmodule manager_module /usr/lib/apache2/modules/mod_manager.so

loadmodule proxy_cluster_module /usr/lib/apache2/modules/mod_proxy_cluster.so

loadmodule slotmem_module /usr/lib/apache2/modules/mod_slotmem.so

mod_cluster.conf:

createbalancers 1

listen 127.0.1.1:6666  managerbalancername mycluster    <virtualhost 127.0.1.1:6666>      keepalivetimeout 300      maxkeepaliverequests 0      advertisefrequency 5      serveradvertise on        <location />          order deny,allow          allow 127.0.0      </location>     </virtualhost>

virtual host:

#serveradmin me@domain.edu  servername jboss.cluster  serveralias jboss.cluster   proxypass / balancer://mycluster stickysession=jsessionid|jsessionid nofailover=on proxypassreverse / balancer://mycluster proxypreservehost on  <location />      order deny,allow      allow  </location>

sethandler mod_cluster-manager order deny,allow #deny allow 127.0.0

    errorlog ${apache_log_dir}/jboss_cluster_error.log      loglevel debug      customlog ${apache_log_dir}/jboss_access.log combined

standalone.xml:

<extensions> <extension module="org.jboss.as.clustering.infinispan"/> <extension module="org.jboss.as.connector"/> <extension module="org.jboss.as.deployment-scanner"/> <extension module="org.jboss.as.ee"/> <extension module="org.jboss.as.ejb3"/> <extension module="org.jboss.as.jaxrs"/> <extension module="org.jboss.as.jdr"/> <extension module="org.jboss.as.jmx"/> <extension module="org.jboss.as.jpa"/> <extension module="org.jboss.as.jsf"/> <extension module="org.jboss.as.logging"/> <extension module="org.jboss.as.mail"/> <extension module="org.jboss.as.naming"/> <extension module="org.jboss.as.pojo"/> <extension module="org.jboss.as.remoting"/> <extension module="org.jboss.as.sar"/> <extension module="org.jboss.as.security"/> <extension module="org.jboss.as.transactions"/> <extension module="org.jboss.as.webservices"/> <extension module="org.jboss.as.weld"/> <extension module="org.wildfly.extension.batch"/> <extension module="org.jboss.as.modcluster"/> <extension module="org.wildfly.extension.io"/> <extension module="org.wildfly.extension.undertow"/> </extensions>

...

<mod-cluster-config advertise-socket="modcluster" connector="ajp">   <dynamic-load-provider>   <load-metric type="cpu"/>   </dynamic-load-provider>   </mod-cluster-config>   </subsystem>

......

<interface name="public"> <inet-address value="${jboss.bind.address:0.0.0.0}"/> </interface> <interface name="unsecure"> <inet-address value="${jboss.bind.address.unsecure:127.0.0.1}"/> </interface> </interfaces>   <socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}"> <socket-binding name="management-http" interface="management" port="${jboss.management.http.port:9990}"/> <socket-binding name="management-https" interface="management" port="${jboss.management.https.port:9993}"/> <socket-binding name="ajp" port="${jboss.ajp.port:8009}"/> <socket-binding name="modcluster" port="0" multicast-address="224.0.1.105" multicast-port="23364"/> <socket-binding name="http" port="${jboss.http.port:9090}"/> <socket-binding name="https" port="${jboss.https.port:8443}"/> <socket-binding name="txn-recovery-environment" port="4712"/> <socket-binding name="txn-status-manager" port="4713"/> <outbound-socket-binding name="mail-smtp"> <remote-destination host="localhost" port="25"/> </outbound-socket-binding> </socket-binding-group>

vhost error log jboss_cluster_error.log: