Changing values of 1st column of a matrix using take(mymatrix, (0, ), axis=1)

[Anthony Liu]

I am talking about the 'take' method of numarray.

See here for more info:

http://stsdas.stsci.edu/numarray/Doc/node33.html

If I initialize a matrix 'mymatrix' by zeros((3,3),
type="Float64"), I get a 3*3 matrix of all zeros.

Look:

>>> from numarray import *
>>> mymatrix = zeros((3,3), type="Float64")
>>> mymatrix
array([[ 0.,  0.,  0.],
       [ 0.,  0.,  0.],
       [ 0.,  0.,  0.]])
>>> 

I want to change the zeros of only the first column to
1's.  In other words, I want to get:

array([[ 1.,  0.,  0.],
       [ 1.,  0.,  0.],
       [ 1.,  0.,  0.]])

The 'take' method is able to take out the first
column, but I am not sure if there is a good way of
changing all values of the first column to 1's.

Of course, I know that I can achieve my goal pretty
easily with this:

for i in range(3): mymatrix[i,0] = 1.0

I am just wondering if there is an existing numarray
method that elegantly does it for me.


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