r - Count the number of elements in an array fulfilling a simple condition -

r - Count the number of elements in an array fulfilling a simple condition -

i jumping r after long time away , surprised how simple of things do. have created 3 arrays:

xs = runif(n, min=-1, max=1); ys = runif(n, min=-1, max=1); rs = sqrt( xs^2 + ys^2 );

where, obviously, x , y (together) define n points within (-1,1) square , r vector defining distances of these points.

if want count number of elements in rs less or equal 1, there simple inl-line command this?

sum( rs <= 1 )

rs <= 1 yields logical vector. true equals 1; false equals 0.

arrays r