how to write equation in legend correctly in latex

I am trying to write following legend using latex interpreter but I keep getting this error:

"String scalar or character vector must have valid interpreter syntax"

This is my legend information. 'a' is just a number defined in the script. Suggestions will be highly appreciated.

Dharma

legend(['$t_{1}=t_{2}± $' num2str(a*100)])

set(legend,'Interpreter','latex');

set(legend,'FontSize',10);

Answer 1

[Scott MacKenzie]

MATLAB by default uses a subset of TeX. That's probably all you need:

% test data
a=1.2345;
plot(rand(1,5));

legend(['t_{1}=t_{2}±' num2str(a*100)]);
set(legend,'FontSize',10);