Custom latex printing for Function subclass

[G B]

I haven't moved to 0.7.6 yet, so I'm still using 0.7.5.

I'm trying to create a custom subclass of Function, which is sure to emit more questions later, but for now the question is: "how do I the LatexPrinter to display it as anything but name(x,y)"?  It looks like that's the behavior if there isn't a _print_name() function in LatexPrinter itself, and LatexPrinter doesn't appear easily extensible.

Is there a method I can add to my custom subclass that describes how it should be printed?

[Aaron Meurer]

Each printer has a method that you can define on your custom classes
that will define how to print your class with that printer. If you
search http://docs.sympy.org/latest/modules/printing.html for
"printmethod" you will find them. The one for the LaTeX printer is
called _latex. The docs should be improved, but the function signature
is like

def _latex(self, printer, *args)

printer will be the printer object itself. You should use it to
recursively print other objects. For example, if I had a class alpha
that I wanted to print like \alpha \left (x, y\right) I would do
something like

def _latex(self, printer, *args):
return r'\alpha \left (' + ', '.join(printer.doprint(arg for arg
in args) + r'\right )'

If you search the SymPy code for "def _latex" you'll find many examples.

Aaron Meurer

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