On Sat, May 16, 2015 at 8:17 PM, Ronald L. Rivest <rivest....@gmail.com> wrote:
> When I type
> random_matrix?
> at the sage notebook, I get documentation that says, for example, that the
> matrix
> entries will never be zero. But they are, even in the given example. What
> does
> "and never zero" mean here?
It's definitely a mistake in the documentation. I wrote the code that
generates these matrices, and there's nothing at all in there to
restrict to nonzero values in the given interval. Somebody else
inexplicably added the nonzero business to the documentation... 5
years ago in this ticket:
http://trac.sagemath.org/ticket/9803
I'll ask them to open a ticket and fix the mistake in the documentation.
And... I'm excited to see you trying Sage ! I'm a big fan of RSA :-)
-- William
> Thanks,
> Ron Rivest
>
> The distribution keyword set to uniform will limit values between -2 and 2,
> and never zero.
>
> sage: random_matrix(ZZ, 5, 5, distribution='uniform')
> [ 1 0 -2 1 1]
> [ 1 0 0 0 2]
> [-1 -2 0 2 -2]
> [-1 -1 1 1 2]
> [ 0 -2 -1 0 0]
>
>
>
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--
William (http://wstein.org)
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