How to make a root locus plot square aspect ratio

2015 10 7
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更新时间：2023 11 8
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I have tried:
s = tf('s');
sysL = (s^2+1)/(s*(s^2+4));
rlocus(sysL);
v=[-4 4 -4 4];
axis(v);
axis('square');
But I get a message that says: Warning: This plot type does not support this option for the "axis" command.
I am using 2013b

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Star Strider
Star Strider 2015-10-7
编辑：Star Strider 2015-10-7

1 个投票

It does not support axis('square'). It does support axis('equal'), but that overrides your axis(v) call.
You can override the aspect ratio with the 'Position' figure property:
s = tf('s');
sysL = (s^2+1)/(s*(s^2+4));
rlocus(sysL);
v=[-4 4 -4 4]; axis(v);
hpos = get(gcf, 'Position'); % Get 'Position'
set(gcf, 'Position',[hpos([1 2 4]) hpos(4)]) % Set Width = Height
Experiment to get the result you want.

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Daniel
Daniel 2015-10-7
OK. That is better than what I started with.
However, is there any way to force a square aspect ratio? I don't really need the axis(v) since I did that just to try to force an equal axis length which axis('equal') already accomplishes.
My problem is that if the plot doesn't come up as a square or if I manually resize the plot, then the angles look all messed up.
Daniel
Daniel 2015-10-7
Great. I modified your code a bit to re-capture what axis('equal') does, since I like that function and it saves me the step of trying to figure out what my axis limits should be.
s = tf('s');
sysL = (s^2+1)/(s*(s^2+4));
rlocus(sysL);
hpos = get(gcf, 'Position'); % Get 'Position'
set(gcf, 'Position',[hpos([1 2 4]) hpos(4)]) % Set Width = Height
axis('equal');
Ryszard Nowacki
Ryszard Nowacki 2023-11-8
Is there any way to do this with the R2023b version?
Star Strider
Star Strider 2023-11-8
Ran in:
Ran in:
@Ryszard Nowacki — I just now tested that same code here (R2023b), and it seems to work correctly.
Comparing them —
s = tf('s');
sysL = (s^2+1)/(s*(s^2+4));
figure
rlocus(sysL);
figure
rlocus(sysL);
hpos = get(gcf, 'Position'); % Get 'Position'
set(gcf, 'Position',[hpos([1 2 4]) hpos(4)]) % Set Width = Height
axis('equal');
It works as desired in R2023b.
.

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