Le jeudi 16 juin 2011 à 08:34 -0400, Alan Bromborsky a écrit :
> I defined a user function by -
>
> def dot(x,y):
> return(sympy.Function('dot')(*(x,y)))
That's not really a user function in the sympy sense, just an ordinary
Python function that happens to return an expression containing a
symbolic function.
>
> I want the _print_Function in str.py to handle this in a special way so
> I modified it to
>
> def _print_Function(self, expr):
> if expr.func.__name__ == 'dot':
> return '(%s|%s)' % (expr.args[0],expr.args[1])
> else:
> return expr.func.__name__ +
> "(%s)"%self.stringify(expr.args, ", ")
>
Patching core sympy code isn't the recommended way to implement your
custom logic. It would be better to do something like:
class dot(Function):
nargs = 2
def _sympystr(self):
return '(%s|%s)' % self.args
> but for example if "dot(a1,a2)" is in an expression then "dot(a1,a2)"
> prints and not "(a1|a2)".
> What am I doing wrong?
What you did should have worked, I think. Can you give examples of wrong
output?
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