Matlab Application Compiler omits function call

Question

I have two *.m files with two functions

function one is main(folder_path) the second one is calculate(file)

function main calls calculateand writes the results to a text file using fprintf

When I run the script in Matlab, it writes correct floating point values to the text file. However, when I use the Application Compiler and create a *.exe file, all results are NaNin the text file.

I inserted some debug outputs and noticed, that none of the outputs in calculateis printed when using the *.exe. So I guess that the function calculateis never called.

Is there any reason for such a behavior? Am I missing anything?

% file main.m
function main(folder_path)
wildcard = '*.h5';

files = dir([folder_path , wildcard]);

% store results
[num_files, ~] = size(files);
vec_average = zeros(num_files);

for index = 1:size(files)
    average = calculate([folder_path, files(index).name]);

    % store in vector for matlab plotting
    vec_average(index) = average;
end

% calculate avg value from all files
average = mean(vec_average);

% write to text files, for jenkins plotting
[file, msg] = fopen('average.property', 'w');
if file == -1
    error(msg);
end
fprintf(file, 'YVALUE=%.5f\n', average(1));
fclose(file);
end

next file:

% file calculate.m
function [average] = calculate(file_path)
% read datasets - loop over h5 file
data = h5read(file_path ,'/datasets' );

num_elements = data.num_elements;
elements = data.elements;

vec_y = [];

for index = 1:size(elements)
    vec_y = [vec_y, elements(i)];
end

average = mean(vec_y);
end

Answer 1

If calculate is never called -> it means that your files variable is empty -> are you sure that your are calling the main program the same way? i.e. is folder_path the same in both calls?

If your on windows you can run from a dos prompt and you will see an error/disp/fprintf messages that would normally be written to the terminal (So to help debug add a lot more, e.g. folder_path, num_files etc...