The method should have the signature _latex(self, printer), and you
should use printer._print() to recursively print things. See
https://docs.sympy.org/latest/guides/custom-functions.html#printing
Aaron Meurer
On Fri, Sep 9, 2022 at 9:20 AM brombo <abrombo...@gmail.com> wrote:
>
> I have written the custom class PieceWiseFunction. One of the class members
> is:
>
> def _latex(self):
> s = r'\left \{\begin{array}{c}'+'\n'
> s += r'x < '+latex(self.x[0])+': '+latex(self.f[0])+r' \\ '+'\n'
> for i in range(1,len(self.x)):
> xlo = latex(self.x[i-1])
> xhi = latex(self.x[i])
> f = latex(self.f[i])
> s += xlo+r' \le x < '+xhi+r': '+f+r' \\ '+'\n'
> s += r' x \ge '+latex(self.x[-1])+': '+latex(self.f[-1])+'\n'
> s += r' \end{array}\right \}'
> return s
>
> I am trying to use the sympy "latex" function to access my _latex and get the
> following error message:
>
> File
> "/home/brombo/.local/lib/python3.8/site-packages/sympy/printing/printer.py",
> line 309, in _print
> return getattr(expr, self.printmethod)(self, **kwargs)
> TypeError: _latex() takes 1 positional argument but 2 were given
>
> What am I doing wrong in my definition of _latex?
>
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