Re: [Maxima-discuss] Correct Syntax for Greek Letters in Maxima Batch Files for LaTeX Export

[Robert D. <rob...@gm...>]

Foad, I tried the examples you gave, as I'm keen to make sure the TeX
stuff is working ...

> ```maxima
> tex(sigma = matrix([sigma[xx], sigma[xy]], [sigma[yy], sigma[yx]]))
> ```
>
> in the maxima REPL and I it got stuck for some reason!

Did you omit the semicolon or dollar sign at the end? If so Maxima
will wait to see if there's more input.

> I ran the same command in WxMaxima and I got
>
> ```latex
> $$\sigma=\ifx\endpmatrix\undefined\pmatrix{\else\begin{pmatrix}\fi  \sigma_{{\it xx}}&\sigma_{{\it xy}}\cr \sigma_{{\it yy}}&\sigma_{ {\it yx}}\cr \ifx\endpmatrix\undefined}\else\end{pmatrix}\fi $$
> ```
>
> which is syntactically wrong.

I dunno, I pasted that into a trivial document and latex says it's
okay. What is the error you get? Are you maybe working with amstex
instead of latex?

>Then I tried Robert's suggestion:
>
> ```maxima
> texput(sigma_xx, "\\sigma_xx");
> texput(sigma_xy, "\\sigma_xy");
> texput(sigma_yy, "\\sigma_yy");
> texput(sigma_yx, "\\sigma_yx");

In order to get the expected output, I think you need "\\sigma_{xy}" there.

> tex(sigma = matrix([sigma_xx, sigma_xy], [sigma_yy, sigma_yx]));
> ```
>
> and I got
>
> ```latex
> $$\sigma=\ifx\endpmatrix\undefined\pmatrix{\else\begin{pmatrix}\fi \sigma_xx&\sigma_xy\cr \sigma_yy&\sigma_yx\cr  \ifx\endpmatrix\undefined}\else\end{pmatrix}\fi $$
> ```
>
> which is also wrong.

Well, latex says it's okay, and produces the expected DVI for that
input. What is the error you're getting?

> I tried the command
>
> ```maxima
> sigma = matrix([sigma[xx], sigma[xy]], [sigma[yy], sigma[yx]])
> ```
>
> inside the WxMaxima and used the LaTeX export, and I got
>
> ```latex
> \[sigma\operatorname{=}\begin{pmatrix}{{sigma}_{\ensuremath{\mathrm{xx}}}} & {{sigma}_{\ensuremath{\mathrm{xy}}}}\\
> {{sigma}_{\ensuremath{\mathrm{yy}}}} & {{sigma}_{\ensuremath{\mathrm{yx}}}}\end{pmatrix}\]
> ```
>
> which, despite being a bit bloated, is a valid LaTeX equation.

Well, given the \operatorname bit, I guess you must be working with
amstex. Is that right? Does that account for the other problems?

best

Robert