Why can't I call the first function inside the second one? I keep getting an error as the function was not defined.

I have these two functions, the first one inside a sumNumbersInNFiles.m and the second on inside a sumNumbersInFile.m

However, I cannot figure out why the function is not correctly being called.

I keep getting an error when using the following line of code:

partial_sum = sumNumbersInFile(file_name);

function sum = sumNumbersInNFiles();

numberOfFiles = input('Enter the number of files: '); 

total_sum = 0;

for i = 1:numberOfFiles
    fileID = -1;
    errmsg = 'The file was not opened!';
    file_name = '';
    while fileID < 0 
    file_name = input('Open file: ', 's'); 
    %remember to write the file extension .txt
    [fileID,errmsg] = fopen(file_name);
    partial_sum = sumNumbersInFile(file_name);
    total_sum = total_sum + partial_sum;
    end   
end

end

function sum = sumNumbersInFile(file_name);
%characters array
numbers = ['0' '1' '2' '3' '4' '5' '6' '7' '8' '9'];
%initialize sum to zero
sum = 0;

fileID = -1;
%error message in case the file doesn't open
errmsg = 'This is an error message';
while fileID < 0 
   file_name = input('Open file: ', 's'); 
   %remember to write the file extension .txt
   [fileID,errmsg] = fopen(file_name);
end

%checks if end of file was achieved
while ~feof(fileID)
%reads one line of the text file
tline = fgetl(fileID);
    %traverses the string obtained from the previous command
    for i = 1:strlength(tline)
        %compares the current character with the numbers
        logical_array = (tline(i) == numbers);
        %there are 10 numbers in the list
        for j = 1:10
            %checks if any of the numbers match the current character
            if logical_array(j)==1
            %sums the value if true
            sum = sum + str2double(tline(i));
            end
        end
    end
end

end

[Tommy]

Are these two files located in the same folder? If not, sumNumbersInFile.m needs to be on your MATLAB path in order for sumNumbersInNFiles.m to find it.

[Gabriel Gomes]

Yeah, unfortunately I have tried this already. It didn't work. Both .m files are in the same directory. I also tried to use them in another folder, however, I got no result.

[Tommy]

Hmm what is the full error message?

[Gabriel Gomes]

Unrecognized function or variable 'sumNumbersInFile'.

[Tommy]

What does

which sumNumbersInFile

return? Is the file containing sumNumbersInFile() definitely called sumNumbersInFile.m? You don't see a warning like this?