[Numpy-discussion] setting items in a matrix

Charles R Harris charlesr.harris@gmail....
Fri Dec 21 11:01:49 CST 2007


On Dec 21, 2007 12:37 AM, devnew@gmail.com <devnew@gmail.com> wrote:

> hi
> i am a beginner with numpy and python,so pardon me if this doubt seems
> silly
> i want to create a matrix with say 3 rows and 5 columns..and then set
> the values of each item in it .for this i did something like below
>
> myarray=zeros((3,5))
> #then set the items
> for row in range(3):
>    for col in range(5):
>        myarray[row][col]=999999.9999
>
>
In [1]: a = zeros([3,5])

In [2]: a[...] = 999

In [3]: a[0:2,0:2] = 99

In [4]: a
Out[4]:
array([[  99.,   99.,  999.,  999.,  999.],
       [  99.,   99.,  999.,  999.,  999.],
       [ 999.,  999.,  999.,  999.,  999.]])

Chuck
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