MATLAB: Sprintf with latex problem

latexsprintftitle

I just cannot figure out what the problem is with this line, please help. I get this warning sometimes:

Warning: Error updating Text.
   Character vector must have valid interpreter syntax:
  $ρ_t = 0.26ρ_f, θ_0 = 90°$

Regardless, the subscripts never take. Here is the problematic line:

title(sprintf('$%c_t=%.2f%c_f,%c_0=%2.0f%c$',961,idens,961,952,iang*180/pi,176),'Interpreter','latex');

latex cannot have any characters with position greater than 255. That is violated by your 961 (rho) and 952 (theta).

Use \rho and \theta

You need to have the leading and ending symbol $.

e.g., ylabel('$J_{1}(\rho)$','interpreter','latex')

Because sprintf interprets '\r' as a carriage return. Use '\\r' instead.

text(.1,.5,sprintf('$$c_{[\\rho_{e}]_w^m}$$= %.3f',18.556), ...
    'Interpreter', 'latex', 'fontsize', 10);