How to add an accent mark in a label of a graph when using latex interpreter?

I got an error of syntax when using interpreter latex and a accent mark, for example this is the line I want to run, where the accent mark is in the "i" uppercase in the beggining:

xlabel('Índice $e_{i}$','interpreter','latex')

While this is not possible the only thing I can do is avoid the accent mark as follows:

xlabel('Indice $e_{i}$','interpreter','latex')

This is not ideal, do someone know how to get the first line of code working properly?

Answer 1

[Star Strider]

The acute accent is coded as \' (‘escaped’ apostrophe) so within a quoted character array it has to be \'' —

figure
xlabel('\''Indice $e_{i}$','interpreter','latex', 'FontSize',20)        % Character Array

figure
xlabel("\'Indice $e_{i}$",'interpreter','latex', 'FontSize',20)         % String Array

Source: Page 22 of The Not So Short Introduction to LaTeX 2e

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