On Tue, Jul 27, 2010 at 12:50 AM, Simon King <simon.k...@nuigalway.ie> wrote: > Hi Drenwal, > > On 25 Jul., 10:52, drenwal <dren...@free.fr> wrote: >> But, I would prefer to use a more mathematical notation, like Y[k] or >> y...@k or whatever non already used symbol instead of Ac(y,k). > > As Johannes has pointed out, Y[k] is already used, so, this might not > be what you want. But, if it is, overwrite __getitem__ of matrices > (this is the method that Python expects if you do Y[...]). > '^' is also used; if you still want to use it, overwrite __pow__. > >> How is it possible to do that? > > I don't know if/how '@' can be made use of. Usually, it seems that @ > indicates that a so-called decorator is being used. > > Talking about generators: There is a decorator that allows to define a > custom infix operator (see > http://www.sagemath.org/doc/reference/sage/misc/misc.html#sage.misc.misc.infix_operator). > This might be what you were looking for, because it allows to create > new operator names. > > Example: > sage: from sage.all import infix_operator > sage: @infix_operator('multiply') > ....: def foo(a,b): > ....: return '%s acts from the right on %s'%(b,a) > ....: > sage: 5 *foo* 2 > '2 acts from the right on 5' > > Of course, in your case, it would be > return b.transpose()*a*b
This is exactly what I was going to suggest. This is how we handle the backslash operator for linear system solving: http://hg.sagemath.org/sage-main/file/426be7b253ad/sage/misc/preparser.py#l1310 - Robert -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
