Why do I receive an error with the save function?

Hi Mathworks Community,

i am working with dicom files and want to resize CBCT images.

I got the following code and receive the error listed below. Any help is much appreciated!

for k = 1:size(myCBCT3D, 3)
    for l = 1:size(myCT3D, 3)
        temp_1 = size(myCT3D(:, :, l));
        temp_2 = size(myCBCT3D(:, :, k));

        % Resize of CBCT image
        myresizeCBCTimage = imresize(double(temp_2), 1/rzFactor);

        % Calculate number of pixels to add after CBCT is resized
        temp = double((size(temp_1) - ceil(size(temp_2)/rzFactor))/2);

        % Add zeros to CBCT using the number of pixels to add
        mypadCBCTimage = padarray(myresizeCBCTimage, temp, 0);
        
        % Save new CBCT images in .mat file
        save(matFile, mypadCBCTimage, '-append', '-nocompression');
    end
end

The error I am getting is:

Error using save

Must be a string scalar or character vector.

Error in getVoxelsize_test (line 99)

save(matFile, mypadCBCTimage, '-append', '-nocompression');

So does that mean there is a problem with the converting to double part?

How can I fix this?

Thanks in advance!

Answer 1

[Jan]

save gets the name of the variable, nit the variable itself:

save(matFile, 'mypadCBCTimage', '-append', '-nocompression');
%             ^              ^   You need the quotes

[Dende]

That does make sense. Thanks!