Am Montag, den 15.03.2010, 00:48 -0700 schrieb Alec Mihailovs:
> On Mar 15, 3:39 am, Alec Mihailovs <[email protected]> wrote:
> > The second problem is that something strange happens for 1x1 matrices,
> > with any dtype,
> >
> > matrix(fromfunction(lambda i,j:i-j,(1,1),dtype=int))
> >
> > []
> >
> > matrix(fromfunction(lambda i,j:i-j+3,(1,1),dtype=int))
> >
> > [0 0 0]
> > [0 0 0]
> > [0 0 0]
>
> 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]
>
> Alec Mihailovs
>
Are you using an older version of Sage? In Sage Version 4.3.3, Release
Date: 2010-02-21:
sage: fromfunction(lambda i,j:i-j+3,(1,1),dtype=int)
---------------------------------------------------------------------------
NameError Traceback (most recent call
last)
/home/ecki/<ipython console> in <module>()
NameError: name 'fromfunction' is not defined
and with David Joyner's method:
sage: n=5; matrix([[10*i+j for j in range(n)] for i in range(n)])
[ 0 1 2 3 4]
[10 11 12 13 14]
[20 21 22 23 24]
[30 31 32 33 34]
[40 41 42 43 44]
sage: n=1; matrix([[10*i+j for j in range(n)] for i in range(n)])
[0]
Eckhard
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