Neon Absentius <[EMAIL PROTECTED]> writes: > On Tue, Sep 06, 2005 at 09:33:48PM +0000, Neon Absentius wrote: > >> there seems to be a bug: After I give 'm v' if I ask calc to >> simplify the expression 'a b - b a' it leaves it as is which is as >> expected. However when I ask it to expand '(a+b)^2' it returns >> 'a^2 + 2 b a + b^2' which is of course wrong if a and b don't commute. >> This happens both with emacs-multi-tty (22.0.50) and whith emacs >> 21.4.1 on a Debian testing/unstable. The bug manifsts itself also >> for the expansion of '(a+b)^3' however calc expands '(x+y)(x-y)' >> into 'x^2 + y x - x y + y^2'. Strange! > > Maybe not so strange.
Maybe not strange, but still a bug. > Probably calc uses formulae (the binomial expansion?) to expand the > power instead of fully distributing the multiplication over the > addtition "by hand", so to speak. Of course the binomial expansion > is not valid if the variables involved do not commute. That is what happens. It should be fixed soon. Jay _______________________________________________ Help-gnu-emacs mailing list Help-gnu-emacs@gnu.org http://lists.gnu.org/mailman/listinfo/help-gnu-emacs
