How to get subscripts in the legend of a Nichols plot?
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How do I put subscripts in a Nichols plot legend?
This works fine in a normal plot:
figure
plot([0 1],[3 4]); hold on
plot([0 1],[4 5])
plot([0 1],[5 6])
legend('G_2', 'G^2', 'G^2_p')
saveas(gcf,'test1.png')
produces:
But:
figure
nichols(Gp); hold on
nichols(Gc1*Gp);
nichols(Gc2*Gp);
legend('G_2', 'G^2', 'G^2_p')
saveas(gcf,'test2.png')
produces:
I tried this:
figure
nichols(Gp); hold on
nichols(Gc1*Gp);
nichols(Gc2*Gp);
legend('$G_2$', '$G^2$', '$\hat{G}^2_{p}$','Interpreter','Latex')
Produces:
Maybe this is the same bug reported in this question in 2015: Subscripts in MATLAB Legends
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Risposta accettata
Adam Danz
il 28 Ago 2020
This is caused by an extra excape character added when the legend is initially created.
As explained in that link, you can call the legend twice and the second time should fix the problem.
% Demo
H = tf([-4 48 -18 250 600],[1 30 282 525 60]);
nichols(H)
legend('G^2_p')
legend('G^2_p') % <-- intentionally called again
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