How do add a bar on top a letter while the letter also has a subscript

If I want to write the following expression on any xlabel or colorbar label:

How do I do this exactly? The following way to insert the above expression does not seem to work in MATLAB R2018 version!!!!

c2_bank_v6b2.Label.String = ["norm Prop Conc in the proppant bank" ...
  "($\bar{c}$_{Prop} / $\bar{c}$_{PropMax})"];

Please and thanks. Mousumi

Answer 1

[Walter Roberson]

'$\overline{C}_{Prop} / \overline{C}_{PropMax}$'

[Mousumi Ghosh]

Hello Walter:

It didn't work! It looked like the following (as shown inside the circled portion of the image:

Any ideas!

Thanks. Mousumi

[Walter Roberson]

It looks to me as if you might not have specified 'interpreter', 'latex'

[Mousumi Ghosh]

Hello, thanks for the tip! It worked once I stated the interpreter!

I have an additional question. What is the default FontName for everything (axis labels, legends and so on)?

Thanks. Mousumi

[Walter Roberson]

"The default font depends on the specific operating system and locale."

On my system:

>> get(0,'DefaultTextFontName')
ans =
    'Helvetica'

[Mousumi Ghosh]

Hello Walter:

Could you help me in converting the above equation (after all the bar on top and subscripts have been added) back in TeX form so that I can change the FontName?

In LaTeX mode, the text does not stand out!

Please and thanks. Mousumi

[Walter Roberson]

Are you sure you want to change the font and not the boldness?

You can change fonts within math mode to a limited extent. See https://tex.stackexchange.com/questions/58098/what-are-all-the-font-styles-i-can-use-in-math-mode but note that it can be difficult to add a package. The ones I can get to work are

\mathrm \mathit \mathnormal \mathcal

I do not seem to find a way that works outside of latex math mode. I see hints it should be possible in tex math mode, but I do not seem to be able to get the overbar to be recognized as a single command instead of being recognized as \o followed by verbar .

[Mousumi Ghosh]

Actually, you are correct! I want to change the boldness, but also font type would be good too! Is there a quick way to bolden the equation above?

[Walter Roberson]

It appears you can use \mathbf

https://tex.stackexchange.com/questions/595/how-can-i-get-bold-math-symbols

[Dyuman Joshi]

Accepted as Walter's answer and following responses comprehensively solve the problems posed.