How to insert loop variable inside plot label?

I want to insert the value of the loop variable inside a label next to a string. How do I do it?

for i = 1:n

    subplot(1,n,i)
    plot(1:m,THETA(i,:))
    hold on
    plot(1:m+1,THETA_est_rls(i,:))
    plot(1:m+1,THETA_est_ewrls(i,:))
    legend('true','RLS','EWRLS')
    xlabel('Iterations');
    ylabel('\theta', i);

Answer 1

[Star Strider]

I assume you want to include it in your ylabel call.

This works:

ylabel(sprintf('\\theta %d', i));

The double \\ are necessary to get one of them to print correctly. (The leading \ operates as an ‘escape’ character.)

[Riccardo Canola]

Thanks! Very helpful

[Star Strider]

As always, my pleasure!

If you want the index ‘i’ to appear as a subscript instead, this works:

ylabel(sprintf('\\theta_{%d}', i));

[Riccardo Canola]

Ok. What if I want also to put a cap over theta. Do I have to use latex?

[Star Strider]

For the cap, yes.

ylabel(sprintf('$\\hat{\\theta}_{%d}$', i), 'Interpreter','latex');

[Riccardo Canola]

Awesome. Thanks again!

[Star Strider]

As always, my pleasure!