On 12/21/06, Keith Goodman <[EMAIL PROTECTED]> wrote:
> I have the following two lines in a for loop:
>
> if len(idx):
> x[idx,i] = x[idx,i-1]
>
> where idx is the output of a where statement.
>
> I need the 'if len(idx)' line to prevent an error when idx is empty.
>
> Would it make sense to allow
>
> x[idx,i] = x[idx,i-1]
>
> when idx is empty instead of raising an error?
>
> The error I get is
>
> ValueError: array is not broadcastable to correct shape
Why doesn't this work?
>> y
matrix([[ 0.93473209, 0.34122426],
[ 0.68353656, 0.77589206],
[ 0.50677768, 0.25089722]])
>> idx = M.array([1, 2])
>> y[idx,0] <------this works
matrix([[ 0.68353656],
[ 0.50677768]])
>> y[idx,0] = y[idx,1] <------but this doesn't
---------------------------------------------------------------------------
exceptions.ValueError Traceback (most
recent call last)
ValueError: array is not broadcastable to correct shape
But this works:
>> idx = M.asarray(M.asmatrix(idx).T)
>> y[idx,0] = y[idx,1]
_______________________________________________
Numpy-discussion mailing list
Numpy-discussion@scipy.org
http://projects.scipy.org/mailman/listinfo/numpy-discussion
