Re: [Numpy-discussion] Numpy unexpected (for me) behaviour

Hi,

#This does not work import numpy a=numpy.zeros(10) b=numpy.ones(4, numpy.int) a[b] += 1

The problem here is that you are setting a[1] to a[1]+1. I think you want: import numpy a=numpy.zeros(10) b=numpy.ones(4, numpy.bool) a[b] += 1 Best, Matthew