xlabel and ylabel errors

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winfrida mwigilwa
winfrida mwigilwa 2025-2-17
评论： Walter Roberson 2025-2-17
I have the following code:
x = linspace(-2*pi,2*pi,100);
y1 = sin(x);
y2 = cos(x);
figure
plot(x,y1,x,y2)
xlabel('-2\pi < x < 2\pi')
ylabel('Sine and Cosine Values')
when I run it brings the following error
Index exceeds the number of array elements. Index must not exceed 3.
Error in mfano (line 8)
ylabel('Sine and Cosine Values')
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Paul Bower
Paul Bower 2025-2-17
Hi Winfrida, Just FYI ... I ran your code on version R2024b and it works fine.

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Star Strider
Star Strider 2025-2-17
Ran in:
This is instructive:
when I run it brings the following error
Index exceeds the number of array elements. Index must not exceed 3.
Error in mfano (line 8)
ylabel('Sine and Cosine Values')
Check to see if you have a variable named ‘ylabel’.
To do that, run this from a script or your Command Window —
which ylabel -all
/MATLAB/toolbox/matlab/graphics/graphics/axis/ylabel.m /MATLAB/toolbox/matlab/graphics/graphics/specgraph/+matlab/+graphics/+chart/Chart.p % matlab.graphics.chart.Chart method /MATLAB/toolbox/shared/controllib/graphics/+controllib/+chart/BodePlot.m % controllib.chart.BodePlot method /MATLAB/toolbox/shared/controllib/graphics/+controllib/+chart/+internal/+foundation/AbstractPlot.m % controllib.chart.internal.foundation.InputOutputPlot method
You should only get results similar to these. If the first entry is:
ylabel is a variable.
you have identified the problem. The solution is to re-name the variable.
.
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Star Strider
Star Strider 2025-2-17
As always, my pleasure!
Walter Roberson
Walter Roberson 2025-2-17
It is somewhat common to code, for example
ylabel = ('Sine and Cosine Values')
which creates a variable named ylabel instead of calling the function named ylabel

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