How to change _latex_ of log to \ln ?

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And also more changes, for example: tan to \tg, sin to \sen etc. It's very common to use this small differences in classes in Portugal.

asked Jun 03 '11

Pedro Cruz gravatar image Pedro Cruz
135 4 7 16

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You'd have to probably change the code slightly. Of course, in the long run this sort of thing should be fully localizable, but for now it's not done so easily.

sage: sage.functions.trig.Function_tan??
GinacFunction.__init__(self, "tan", latex_name=r"\tan")

So if you changed that to latex_name=r"\tg" you might be in business! That would work for the name as well to some extent, though one might have to be careful with making sure one actually got it back to Ginac - the code for sage.symbolic.function.Function should have much info.

You'd have to build your changes, of course.

I'll try to see if one can do this in a running session; one might have to reinitialize it, but the init signature is different for Function_tan than for GinacFunction.

No matter how many ways I try to do things like

sage: tan.__setattr__('_latex_name',r"\tg")
sage: tan._latex_name
sage: latex(tan)

it doesn't seem to quite work. I just can't get it it initialize this.


posted Jun 03 '11

kcrisman gravatar image kcrisman
7802 20 78 170

updated Jun 03 '11

If I am not mistaken, the attribute _latex_name is a cdef attribute, so, not easily overridden. So, it looks like a missing feature to me: There *should* be methods set_name() and set_latex_name(), that can be used to determine how a function is printed on screen resp. how it appears in LaTeX. Shall I open a ticket for it? Simon King (Jun 04 '11)
That's a great idea. kcrisman (Jun 04 '11)
Related to this: ; And in particular this comment: "...there should be a class _latex_() method to override, I just can't find it at the moment. Maybe someone with more familiarity can chime in. - benjaminfjones (May 09)" Pedro Cruz (Jun 04 '11)
It is a bit disappointing that the latex name (or the name) are not used when evaluating the function: Using a new method set_name() and set_latex_name(), I changed the names of tan such that it is printed `tg` on screen and `\tg` in latex. But when I did `tan(x)` or `latex(tan(x))`, the new name "tg" was not used. Does someone have an idea how that can be solved? Simon King (Jun 04 '11)
The ticket is #11428. I didn't upload a patch, because I can only make latex(tan) customizable, but then latex(tan(x)) won't change, sadly. Simon King (Jun 04 '11)
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I'm not exactly sure how this is a Sage question but in your LaTeX preamble you can write


so that whenever you write "\tg" in the LaTeX code is will appear as "tan" in the document.


posted Jun 03 '11

cswiercz gravatar image cswiercz
839 6 17 33
Thank you for the tex declaration. This is a good solution. The other could be something changing the _latex_ method but I don't know how to do it avoiding changes in latex "preamble". I seems to me that one has to forget \log and then redefine it. \let\tan\undefined \DeclareMathOperator*{\tan}{tg} Pedro Cruz (Jun 03 '11)
No worries. I think kcrisman's answer is at least starting to head in the direction of what you're looking for. cswiercz (Jun 03 '11)

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Asked: Jun 03 '11

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