Re: [sage-devel] matrix pattern classes

2010-02-06 Thread Nicolas M. Thiery
Hi Jason, On Thu, Feb 04, 2010 at 10:34:53PM -0700, Jason Grout wrote: > I'm working on a small class for representing sign matrices, which > are matrices having -1 or 1 entries which represent the class of > real matrices having the same sign pattern. These show up in > communication com

[sage-devel] matrix pattern classes

2010-02-05 Thread Jason Grout
(Sending again, since it doesn't seem to have gone through the first time.) I'm working on a small class for representing sign matrices, which are matrices having -1 or 1 entries which represent the class of real matrices having the same sign pattern. These show up in communication complexity

[sage-devel] matrix pattern classes

2010-02-05 Thread Jason Grout
I'm working on a small class for representing sign matrices, which are matrices having -1 or 1 entries which represent the class of real matrices having the same sign pattern. These show up in communication complexity, for example. At other times, I've wanted to deal with matrices having spec