help debugging latex() printing with trace()

[Eric Majzoub]

I would like to debug the latex printing of an expression that ambiguous.

To reproduce it:

t = var('t')

x = function('x')(t)

latex( diff(x,t)^2 )

This produces ambiguous output, essentially:

partial_t x^2

instead of

(partial_t x)^2

I have tried:

from sage.misc.trace import trace

trace("latex( diff(x,t)^2 )")

but I can't understand in which .py file the translation of "diff" occurs. As I understand the source code, there should be a _latex_(self) for every object or method to display latex code, but I can't seem to find it here.

Any help is greatly appreciated.

[Dima Pasechnik]

This is done in pynac, a Sagemath package written in C++ (a fork of GiNaC)
src/sage/symbolic/pynac.pxi contains the interface to it.

HTH

>
> Any help is greatly appreciated.
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[Nils Bruin]

It happens here:

https://github.com/sagemath/sage/blob/07a2afd65fb4b0a1c9cbc43ede7d4a18c921a000/src/sage/symbolic/pynac_impl.pxi#L691

However, the code deciding whether the base of an exponential expression needs parentheses is elsewhere.