On Thursday, 14 July 2016 11:07:28 UTC+2, Björn Dahlgren wrote:
>
> For reference (if anyone googles this):
>
> >>> latex((y-x)*(z-y), order='old')
> '\\left(y - x\\right) \\left(z - y\\right)'
>
>
That didn't work:
>>> print(latex(f(x) - 1, order='old'))
-1 + f{\left (x \right )}
here's my next iteration
>>> from sympy.core.function import _coeff_isneg
>>> from sympy.printing.latex import LatexPrinter
>>> class MyLatexPrinter(LatexPrinter):
... def _as_ordered_terms(self, expr, order=None):
... return sorted(Add.make_args(expr), key=lambda arg: (_coeff_isneg(
arg),) + arg.sort_key())
...
>>> print(MyLatexPrinter().doprint(f(x) - 1))
f{\left (x \right )} - 1
Unfortunately this relies by importing a non-public function
"_coeff_isneg", so no guarantee that it will keep working. I looked into
the kwarg "order" used by the printers, but I didn't quite manage to figure
out how to pass e.g. a callable which would let non-negativity take
precedence over lexiographical order.
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