get xlabel,ylabel,title from premade plots

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Ethan Leonard
Ethan Leonard 2022-5-13
评论： Ethan Leonard 2022-5-13
Ran in:
I know I can get these values from regular plots I make, either with a plot handle or with get(get(gca,'property'),'String'), like this:
plot(1:10)
xlabel('x label that I wrote')
get(get(gca,'XLabel'),'String')
ans = 'x label that I wrote'
However, I can't seem to do that for "premade" plots, ones that MATLAB makes automatically. For example, it doesn't work for rlocus and lsim. I'll show that here:
H=tf([1],[1 1])
H = 1 ----- s + 1 Continuous-time transfer function.
rlocus(H)
get(get(gca,'XLabel'),'String')
ans = 0×0 empty char array
While it's true that I can access it from the plotting window and change the labels manually, I hope there's a more efficient way to do it. (I'm trying to change the color of the labels.)
Any help would be super appreciated. Upvote for reading. You're all pros.

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采纳的回答

Voss
Voss 2022-5-13
Ran in:
I don't think this will work for every premade plot, but it seems to work for plots created with rlocus
H=tf([1],[1 1]);
rlocus(H);
% apparently there are two axes, and the one you want has
% HandleVisibility set to 'off'.
% use findall to find it:
ax = findall(gcf(),'Type','axes')
ax =
2×1 Axes array: Axes (Root Locus) Axes
set(get(ax(1),'XLabel'),'Color','m')
set(get(ax(1),'YLabel'),'Color','g')
set(get(ax(1),'Title'),'Color','r')

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