Rendering LaTeX math from Fortran comments

Hi all
Does anybody know how can we use latex in fortran source code?

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What exactly do you mean by use LaTeX in Fortran? Do you mean to convert LaTeX math to a Fortran expression? Or maybe to evaluate it and return the result? Or something else?

Hi @ELNS, please take a look at this link, I think this is what you are asking for?

I meant that how can we use latex syntax in fortran language comments , just like how we did it in python docstrings. For example consider that i wrote a subroutine which is implementation of a mathematical expression, so i would like to represent symbolic mode of that expression within my source code.

Or do you mean writing results in an output file using the LaTeX syntax ? And then calling the pdflatex compiler from Fortran ? This could be done with:

call execute_command_line ("pdflatex my_fortran_output.tex")


can we use it for one liner mathematical expressions?

This one line command:

$pdflatex "\documentclass{article} \begin{document} $$f(x) = 0 \iff x = 1$$ \end{document}"  is generating a file whose default name is texput.pdf. But I don’t know if it is what you want… I still don’t get it. Let’s consider this snippet: real function square(x) ! Returns the square of a real number. !$f(x) = x^2\$
real, intent(in) :: x
square = x**2
end function square


Notice the LaTeX math in the “docstring”. Let’s assume what you are trying to do works. What does the result do and what does it look like?

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The objective could be to include LaTeX expressions in a documentation generated with a tool like Doxygen:
http://www.doxygen.nl/manual/formulas.html
http://doxygen.nl/manual/docblocks.html#fortranblocks

If you use the Sublime code editor, the SublimeFortran Package provides hover over popups for inline Latex math in comments.

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Alternatively, I do want to provide good Fortran wrappers for SymEngine to be able to manipulate symbolic expressions from Fortran. I already started at https://github.com/symengine/symengine.f90, but didn’t have time to finish. If anybody wants to help, I would appreciate it.

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That’s exactly what i meant.
Now what if we build the documentation of this subroutine using a tool such as sphinx-fortran?
will the symbolic mode of this latex line be generated ?

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I don’t know if sphinx-fortran can do it, but FORD can.

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If you use the FORD documentation generator, it is possible to include Latex in comments, see here: https://github.com/Fortran-FOSS-Programmers/ford/wiki/Writing-Documentation#latex-support

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Thank you all for your valuable tips

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Not sure if I have understood the question, but if this is about documentation alone, Doxygen works well with LaTeX. There’s some more discussion here.

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