Writing a small epsilon in xlabel with color

Question

Marc Laub 2021-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/748182-writing-a-small-epsilon-in-xlabel-with-color

编辑： dpb 2021-2-17

采纳的回答： dpb

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Hey, I wanted to write a red small epsilon in my label

\color{red} \epsilon

was my first try, but is was the epsilon version i didnt like, i wanted the epsilon you get with

\varepsilon

Problem is, using \varepsilon the command \color doenst work. It doenst work with Latex interpreter, it doenst work without. It doenst work using $ $ like in:

\color{red} $\varepsilon$

... I tried all combinations and arrangements of $ and {} and \ with and without latex interpreter. I am unable to get a red small epsilon that looks like \varepsilon

Same goes for every other letter variant that is acces with \var command. It doenst work with other latex commands together, eventhough both commands alone work.

Can somebody please tell me how to get this working?

Mny thanks in advance

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Answer 1

dpb 2021-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/748182-writing-a-small-epsilon-in-xlabel-with-color#answer_626037

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W/o taking time to try to figure out specific LaTeX syntax inside MATLAB that's always a pain since know nuthink' about LaTeX otherwise,

hLg=legend('$\varepsilon_{21}$','interpreter','latex','textcolor','r');

works.

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Marc Laub 2021-2-17

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Well i just wondered why it works perfectly with a line like

xlabel('\color{red} \epsilon')

but not with

xlabel('\color{red} \varepsilon')

I thought I am doing a mistake. Because the fact that the second version is not working implicates that the varepsilon is different implemented compared to epsilon, in terms how it can be handled (ie changing color). And that didnt make much sence to me why it should be.

dpb 2021-2-17

编辑：dpb 2021-2-17

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Well, the first works because default interpreter is 'TeX', not 'LaTeX'

>> figure
>> hLbl=xlabel('\color{red}\epsilon');  % works correctly
>> hLbl.Interpreter
ans =
    'tex'
>>
>> hLbl=xlabel('$\varepsilon$','Interpreter','LaTeX');  % also works
>> delete(hLbl)
>> hLbl=xlabel('$\color{red}\varepsilon$','Interpreter','LaTeX'); % dies...
Warning: Error updating Text.
 String scalar or character vector must have valid interpreter syntax:
$\color{red}\varepsilon$
 
>> 

The '\varepsilon' name is only valid under LaTeX, but the '\color' is TeX; need the '\usepackage{xcolor}' directive to use '\textcolor{color}{text}] with LaTeX, but there's no way that is known to add packages to the TMW implementation of LaTeX they have bundled with MATLAB.

Sorry state of affairs, but "that's just the way it is..."

I should add it ot my list of peeves I just posted as nits of MATLAB graphics that have bugged me for years excepting since I never knew/used LaTeX anyways, I always just ignored it and lived with what could do with TeX.

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