Warning: Function class has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict

Hi everyone!

I'm trying to run a script that suposses to display a plot; however, MATLAB just shows an empty pop up as well as warning messages:

Warning: Function class has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential

name conflict.

The name of the script is pongball.m, and I have changed it but it doesn't work. I had the R2020a version and I already unistalled it and installed the R2021a version but nothing's changed.

I tried to run another script with a plot, just to see if the problem was my code but it doesn't work either:

close all;

x = 1:0.5:10;

y = x.^2;

plot(x,y)

Does anyone know what is the problem?

Thanks in advance :)

Abby

Answer 1

[Steven Lord]

You've created or downloaded a file named class.m that's preventing MATLAB from calling the built-in class function. Identify that class.m file using which and rename or remove it. Anything under matlabroot you're probably okay leaving in place. Look for class.m files outside matlabroot.

which -all class

built-in (/MATLAB/toolbox/matlab/datatypes/class)
/MATLAB/toolbox/matlab/graph2d/@scribehandle/class.m      % Shadowed scribehandle method
/MATLAB/toolbox/instrument/instrument/@udp/class.m        % Shadowed udp method
/MATLAB/toolbox/instrument/instrument/@i2c/class.m        % Shadowed i2c method
/MATLAB/toolbox/instrument/instrument/@gpib/class.m       % Shadowed gpib method
/MATLAB/toolbox/instrument/instrument/@icdevice/class.m   % Shadowed icdevice method
/MATLAB/toolbox/instrument/instrument/@visa/class.m       % Shadowed visa method
/MATLAB/toolbox/instrument/instrument/@tcpip/class.m      % Shadowed tcpip method
/MATLAB/toolbox/instrument/instrument/@Bluetooth/class.m  % Shadowed Bluetooth method
/MATLAB/toolbox/instrument/instrument/@icgroup/class.m    % Shadowed icgroup method
/MATLAB/toolbox/matlab/serial/@serial/class.m             % Shadowed serial method

[Lydia Abigail Garza Coello]

Thanks a lot! As you mentioned, I created a script with that name, I renamed it and now my code works.

-Abby :)