Adding superscript or subscript and special character in the same title on a figure

I tried to add a title on figure (french language) where the title contains special character and subscript:

> S = '\''Etat x_{1}';
>> title(S, 'interpreter', 'latex')

But I got \'Etat x_{1} rather than état x1 (Note: é is capital and 1 a subscript).

How can I overcome this problem?

Answer 1

[Walter Roberson]

It appears that accents are only recognized in text mode, but that underscores are recognized in math mode. This leads to

S = '\''Etat x$_{1}$'