get xlabel,ylabel,title from premade plots

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.

Answer 1

[Voss]

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')

[Ethan Leonard]

Amazing. Exactly what I needed.