Undefined function/variable with function

In my main script, I have the following:

addpath(genpath('...'));
control_dir = '..'
patient_dir = '..'

% function
load_data(control_dir, patient_dir);

in my load_data function:

function [c_3darray, p_3darray] = load_data(control_dir, patient_dir)

    controls = fullfile(control_dir, '*.mat');
    patients = fullfile(patient_dir,'*.mat');

    control_files = dir(controls);
    patient_files = dir(patients);

    num_roi = 379;
    control_3darray = zeros(num_roi, num_roi, length(control_files));
    patient_3darray = zeros(num_roi, num_roi, length(patient_files));

    for i = 1:length(control_files)
        origFilename = control_files(i).name;
        fullFilename = fullfile(control_dir, origFilename);
    %     fprintf(1, '\nProcessing: %s\n', fullFilename);
        [filepath, name, ext] = fileparts(fullFilename);
        load(fullFilename);

        c_3darray(:, :, i) = cov(x);

    end

    for i = 1:length(patient_files)
        origFilename = patient_files(i).name;
        fullFilename = fullfile(patient_dir, origFilename);
    %     fprintf(1, '\nProcessing: %s\n', fullFilename);
        [filepath, name, ext] = fileparts(fullFilename);
        load(fullFilename);

        cov_mat = cov(fullmat_720tr_sc);

        p_3darray(:, :, i) = cov(x);

    end
    
end

when I run my main script, I get the error: Undefined function or variable 'control_3darray'. What am I missing here?

Answer 1

[Adam Danz]

Given the incomplete error message, it seems that the error is not with the "control_3darray" variable but with x

c_3darray(:, :, i) = cov(x);

In the line above, x is not defined.

Also, c_3darray should probably be control_3darray. Same with p_3darray and patient_3darrayM.

There may be other errors as well but that's all the deeper I looked.

[Anita Sinha]

Yes, I changed some variables before posting the code here. I realized that in my main script, I should have called the function as

[c_3darray, p_3darray] = load_data(control_dir, patient_dir);

[Adam Danz]

The output variable names aren't the problem, though.