Numpy array not updated when assigning unexpected value to dtype('int64') using math.erf() -

Numpy array not updated when assigning unexpected value to dtype('int64') using math.erf() -

i'm trying write output of math.erf() numpy array. i'm doing is:

import numpy np import math a=np.array([0,0,0]) a[0]=math.erf(5)

however, never updated hold values of output of math.erf() should float. doing wrong?

update

when a created list via a=np.asarray(a), seems work.

it updated, doesn't alter type of array hence value not appear change. notice that

a=np.array([0,0,0]) a.dtype

returns

dtype('int64')

since math.erf(5)<1 integer zero.

as alternative (there many ways create array of particular type)

a=np.array([0,0,0],dtype=float) a[0]=math.erf(5)

does expect.

arrays math numpy int