On 03/27/2018 03:11 PM, William Stein wrote: > > Sorry -- I'm not trying to flamebait you, but in order to have any > further discussion, what exactly do you think a floating point number > in a computer is? > What is the mathematical meaning of > >>>> float(1) >
The thread was about casual users, who shouldn't have to care about the implementation details behind what "0.5" means. To a casual user, 0.5 is one-half. I didn't bring this up to fight about by pet bug again, but because of the similarity between this and the fact that 12/4 is not three. Casual users don't want to hear about the coercion framework, categories, maps and what-not -- they just want to be able to put in trivial homework problems and get out the right answers. >> Can two equal matrices have different ranks? > > Yes, e.g., > > X = matrix(GF(3),[0]) > Y = matrix(ZZ,[3]) > [X == Y, X.rank(), Y.rank()] > > --> [True, 0, 1] > But will MATLAB tell you that two equal matrices have different ranks? I know sage will do it. -- 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.
