On Mar 15, 3:48 am, Alec Mihailovs <[email protected]> wrote:
> That seems to be a bug introduced in Sage, not in numpy,
>
> sage: fromfunction(lambda i,j:i-j+3,(1,1),dtype=int)
>
> array([[3]])
>
> sage: matrix(_)
>
> [0 0 0]
> [0 0 0]
> [0 0 0]
Yes, and that happens with other numpy 1x1 arrays as well, converted
to matrices,
from numpy import array
a5=array([[5]])
matrix(a5)
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
[0 0 0 0 0]
I looked at the
matrix??
and the problem seems to be caused by the block of code starting from
if len(args) >= 1:
# check to see if the number of rows is specified
try:
nrows = int(args[0])
args.pop(0)
because of the following numpy arrays feature:
int(a5)
5
By the way, if that will go into a ticket, it would be nice if also
the possibility of defining a matrix through a function be added to
the matrix constructor (along David Joyner's suggestion).
Alec Mihailovs
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