On Aug 17, 5:45 pm, Dan Drake <dr...@kaist.edu> wrote:
> On Wed, 17 Aug 2011 at 10:36AM -0500, Jason Grout wrote:
> > Note that "matrix" below is the *scipy* matrix command, since -pylab
> > overwrote Sage's matrix command. However, matrix multiplication works
> > naturally below, and the matrix-creating command uses matlab-like
> > syntax.
>
> > sage: a=matrix("1 2 3; 4 5 6; 7 8 9")
> > sage: a
> > matrix([[1, 2, 3],
> > [4, 5, 6],
> > [7, 8, 9]])
> > sage: b=a*a.T
> > sage: eig(b)
> > (array([ 2.83858587e+02, 1.14141342e+00, -1.90551232e-15]),
> > matrix([[-0.21483724, -0.88723069, 0.40824829],
> > [-0.52058739, -0.24964395, -0.81649658],
> > [-0.82633754, 0.38794278, 0.40824829]]))
>
> > One conclusion: we should make Sage's matrix command accept a string
> > like the above example and parse it as matlab would.
>
> This is now #11699:http://trac.sagemath.org/sage_trac/ticket/11699
>
> I agree with Rob; this probably should be in matrix(), and not in the
> preparser.
>
> Dan
>
> --
> --- Dan Drake
> ----- http://mathsci.kaist.ac.kr/~drake
> -------
>
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