Using numarray/pylab there's also dot: >>> from pylab import * >>> A = array(range(10)) >>> B = array(range(10)) >>> A * B [ 0, 1, 4, 9,16,25,36,49,64,81,] >>> dot(A, B) 285
It might also make your code more readable. I would like "A dot B", but even using ipython I can only get as close as "dot A, B" >>>Dan Farina <[EMAIL PROTECTED]> 10/18/05 1:33 pm >>> David Pokorny wrote: >Hi, > >Just wondering if anyone has considered macros for Python. I have one >good use case. In "R", the statistical programming language, you can >multiply matrices with A %*% B (A*B corresponds to pointwise >multiplication). In Python, I have to type > >import Numeric >matrixmultiply(A,B) > >which makes my code almost unreadable. > >Thanks, >David The problem here is that Python's parse trees are of non-trivial ugliness. A page on the compiler.ast module: http://docs.python.org/lib/node792.html it is, in fact, perfectly possible to write yourself a pre-processor for your particular application. You may have to fiddle with the token you want for notation depending on how the AST fleshes out (% is used by at least a couple of things, after all). My cursory familiarity with python grammar suggests to me that this particular choice of token could be a problem. I would say try it and see. Keep in mind though that since Python's AST is not a trivial matter like it is in Lisp and the like that doing metaprogramming of this sort probably falls into the category of black magic unless it turns out to be very trivial. Another option is to define your own tiny class that will override the __mult__ method so that you can simply do: A * B Which may not be what you want. df -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
