Re: [sage-devel] Heavy-computation @property in Matrix class
On Tue, Apr 26, 2016 at 10:53:37AM +0200, Johan S. R. Nielsen wrote: > I came across this because it currently breaks tab-completion on > matrices in the Emacs sage-mode: perhaps due to a bug, IPython inspects > the properties when tab-completing, so when a property throws an > exception, no tab-completion is given. That means that invertible > matrices don't tab-complete in sage-mode. The terminal is OK, and I > don't know about other interfaces. Just for the record, this also breaks introspection in the IPython terminal and notebooks: sage: sage: m = matrix([[1,1],[2,2]]) sage: sage: m.*rank*? ... ZeroDivisionError which has been annoying me for a while. Thanks for bringing this up! Cheers, Nicolas -- Nicolas M. Thiéry "Isil" http://Nicolas.Thiery.name/ -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
[sage-devel] Heavy-computation @property in Matrix class
Hi I came across the following in sage/matrix/matrix2.pyx:14367: @property def I(self): r""" Returns the inverse of the matrix, if it exists. """ return ~self Basically, I don't understand why this def should be a property, and it seems to me to be problematic. Specifically: 1) This is a property that can throw an exception. Isn't that a problem? 2) This is a property that runs a heavy computation when called. Isn't that a problem? I came across this because it currently breaks tab-completion on matrices in the Emacs sage-mode: perhaps due to a bug, IPython inspects the properties when tab-completing, so when a property throws an exception, no tab-completion is given. That means that invertible matrices don't tab-complete in sage-mode. The terminal is OK, and I don't know about other interfaces. There are other @property defs in that class, like conjugate and hermitian. Best, Johan -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
