python - Insert a numpy array into another without having to worry about length -


when doing:

import numpy  = numpy.array([1,2,3,4,5,6,7,8,9,10]) b = numpy.array([1,2,3,4,5,6])       a[7:7+len(b)] = b                           # a[7:7+len(b)] has in fact length 3 !

we typical error:

valueerror: not broadcast input array shape (6) shape (3)

this 100% normal because a[7:7+len(b)] has length 3, , not length = len(b) = 6, , thus, cannot receive content of b !

how prevent happen , have content of b copied a, starting @ a[7]:

a[7:???] = b[???]      # [1 2 3 4 5 6 7 1 2 3]

this called "auto-broadcasting", i.e. don't have worry length of arrays.

edit: example if len(a) = 20:

a = numpy.array([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]) b = numpy.array([1,2,3,4,5,6])       a[7:7+len(b)] = b # [ 1  2  3  4  5  6  7  1  2  3  4  5  6 14 15 16 17 18 19 20]

just tell when stop using len(a).

a[7:7+len(b)] = b[:len(a)-7]

example:

import numpy  b = numpy.array([1,2,3,4,5,6])       = numpy.array([1,2,3,4,5,6,7,8,9,10]) a[7:7+len(b)] = b[:len(a)-7] print   # [1 2 3 4 5 6 7 1 2 3]  = numpy.array([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]) a[7:7+len(b)] = b[:len(a)-7] print   # [ 1  2  3  4  5  6  7  1  2  3  4  5  6 14 15 16 17 18 19 20]

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