Nice idea ! Thank you for the hint. BTW, XCas seems to have interesting trig algorithms. I'll try to use its interfaces, but using their documentations seems to be a bit difficult at the moment.
-- Emmanuel Charpentier Le lundi 14 novembre 2016 08:45:45 UTC+1, [email protected] a écrit : > > > > Le dimanche 13 novembre 2016 22:21:09 UTC+1, [email protected] a > écrit : >> >> That means you can probably not expect a workaround, because this is not >> a bug, it is a limitation or a tradeoff. At some point the user must >> understand how things work and do some operations manually, like it was >> partially done by searching the eigenspace for eigenvalue 1. >> > > I was too pessimistic: > > http://www-fourier.ujf-grenoble.fr/%7eparisse/xcasen.html#+M_x:=matrix([[1,0,0],[0,cos(theta),-sin(theta)],[0,sin(theta),cos(theta)]])&+M_y:=matrix([[cos(phi),0,-sin(phi)],[0,1,0],[sin(phi),0,cos(phi)]])&+m:=M_y*M_x&+p,d:=jordan(m))&+trigtan(simplify(tran(p)[0]))& > > Don't try simplify(p*d*inv(p)-m) in the javascript version, it's too slow > (the next update of the native version of giac will return 0 in a few > seconds) > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
