title: Greek letters in axes labels are not working
body: <p>I'm trying to use Greek letters in my xlabel of a plot. Every solution on the internet says that Matlab will accept tex. But instead of the delta-symbol my x-axis is simply labeled 'D' </p>
  
  <pre><code>a = plot(0:40, y);
  hold on
  
  plot(delta_T,brechkraft, 'x')
  errorbar(delta_T, brechkraft,delta_b,'x');
  
  title('2mm Oelschicht');
  
  
  xlabel('\Delta');
  ylabel('Brechkraft D in 1/cm');
  annotation('textbox', [.2 .8 .1 .1],...
      'String', {'Fit: f(x) = m*x + b',    ['m = ', num2str(p(1)) ],    ['b = ', num2str(p(2)) ]});
  shg
  hold off
  
  saveas(a, 'abc1.png','png');
  </code></pre>