Why am i getting this error 'unrecognized function or variable' for the defined function itself

function po(conc,p,k)
main_directory = "D:\Thesis'\New_samples";
s1 = 'PO_CN';
folder = fullfile(main_directory, strcat(s1, conc, '_', p));
sub_folder = fullfile(folder, strcat(s1, conc, '_', p, '_', k));
MM = readmatrix(fullfile(sub_folder,'MuellerMatrixausschnitt36 Bilder.txt'));
end

Error: PO "undefined function or variable"

[Jigar Gopani]

PO or po, I tried both putting the same.

[Walter Roberson]

Did you store the code in po.m ?

[Image Analyst]

Are conc, p, and k all character arrays or strings? None are numbers, right?

How did your main program call the function "po", like what variable values did it pass to it?

Attach ALL THE RED TEXT, not just a snippet from it like you did. It should show line number, the actual line of code, and the full error message, including traceback.

Attach the po.m file. Does the capitalization of the file match that on the "function" line?

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

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Answer 1

[Stephen23]

clc % <---------- !!!!!!!!!!!!!!!!!! DELETE THIS LINE !!!!!!!!!!!!!!!!
    % <- and this line too
function MM = po(conc,p,k)
...
end

If you want to call the main function po(), then you cannot have any other code before that function.