want for loop to stop if k < 4

This part of the program takes a file, and takes the numbers inside that file and puts it into a matrix. It only works when, in each line, it does this 4 times, how do I make it so, if it does it less than 4 times and the line is empty, it stops the for loop?

while ~feof(fid)
    i = i + 1;
    linha = fgetl(fid);
    for k = 1:4
        linha(1) = [];
        [valor, linha] = strtok(linha, ',)'); 
        matriz(i,k) = str2double(valor);  
    end   
end

Answer 1

[Image Analyst]

Try this:

while ~feof(fid)
    i = i + 1;
    linha = fgetl(fid);
    % Break if the line is empty and we won't be able to get 4 numbers from it.
    if isempty(linha)
        break; % Break ot of the while.
    end
    % If we get to here, the line is good and we should be able to get our
    % numbers using the poster's original code (hopefully).
    for k = 1:4
        %linha(1) = [];  % Not needed.
        [valor, linha] = strtok(linha, ',)'); 
        matriz(i,k) = str2double(valor);  
    end   
end

[Pedro Almeida]

I change a few things based on that and it worked, thank you!

Answer 2

[Benjamin Thompson]

Use the break command:

if (k < 4) break;

[Pedro Almeida]

for it to also work with the correct format, I have to put something else like this, but it gives me an error 'Matrix index is out of range for deletion.' in linha(1) = [ ]; anything else I could try?

while ~feof(fid)

i = i + 1;

linha = fgetl(fid);

for k = 1:4

linha(1) = [];

[valor, linha] = strtok(linha, ',)');

matriz(i,k) = str2double(valor);

if (k < 4) & linha == 0

break

end

end

end