Warning: Escaped character '\U' is not valid. See 'doc sprintf' for supported special characters. Warning: Error updating ConstantLine. Execution of script mean as a functi

Dear all,

I only use one line code as below and then I got this warning which I have no idea. Could anybody give me a favor?

Thank you so much,

Best wishes,

Vivian Zhou

[Walter Roberson]

Which MATLAB release are you using?

[Xuanyi Zhou]

Dear Walter Roberson,

Thank you for replying to me. I am using MATLAB 2022a and 2018b. Both of them cannot work this.

Finally, I changed the code as below and it works

% Create a figure
figure;
% Get the current x-axis limits
xLimits = xlim;
% Plot a horizontal dashed blue line at y = 4
yValue = 4;
plot(xLimits, [yValue, yValue], '--b');

Thank you so much.

Best wishes,

Vivian Zhou

Answer 1

[Dyuman Joshi]

Given the warning message - I suspect that you have a overloaded the mean() function by naming a user-defined script as mean.

Check the output of

which mean -all

to find the location of the script, rename it and try again.

[Dyuman Joshi]

I confirmed my suspicision - I made a new script and named it mean() and tried to run the same command to yline(), and I got the same warning message.

Renaming the script solved the problem.

This serves as a reminder to not name scripts or variables the same as inbuilt functions in MATLAB.

[Xuanyi Zhou]

Dear Dyuman Joshi,

Please accept my deepest appreciation for your reply. I tried again with your suggestion, it works so well.

Thank you so much,

Best wishes,

Vivian Zhou

[Dyuman Joshi]

You are welcome! Glad to have helped :)

If my answer solved your problem, please consider accepting the answer.

[Stephen23]

+1 well spotted, Dyuman Joshi. I got distracted by that odd warning message.