Need to stop warning because i need to not show a plot using compassplot
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Warning: Plotting the real and imaginary components of the value provided. Specify both R and Theta values if you do not intend to plot a complex value.
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the cyclist
2025-12-8
I don't recognize that as a warning from a MATLAB function.
Can you post the full code that gives that warning?
Simple testing does not appear to show that message?
compassplot([1 2+3i 2-3i])
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Norman
2025-12-19
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ones
Apparently, sending a real vector as the input generates that warning
figure;tiledlayout(1,2)
nexttile
X = compassplot(ones);
nexttile
X = compassplot([1,-1]);
To avoid the warnings, you can turn the warning off, plot, then turn back on.
[msgstring,warnid] = lastwarn % to see what the warning ID is
figure;tiledlayout(1,2);
nexttile
warnstruct = warning('off',warnid)
X = compassplot(ones);
nexttile
X = compassplot([1,-1]);
warning(warnstruct); % return to previous state
Oddly enough, if you do provide something with real and imaginary components, you do not get the warning.
compassplot(1)
compassplot(1+2i)
I can only guess from the text of the warning that the developers assume that if the user inputs a value with a non-zero imaginary part that the user meant it, but if the input has zero imaginary part then the user might be making a mistake (not sure what that mistake could be). But I could be wrong because the behavior is documented, though one could argue it could be a tad more clear on this particular case. Personally, I think this warning is overkill, though I'd be interested if there's some corner case where it helps keep the user from doing something unintended.
Note that the warning still shows up even if the input explicitly has a complex attribute
x = complex(1,0);
whos x
compassplot(x)
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