MATLAB: Another way to do what strsplit does

functionstring

Hello.
What I am looking for is a way to do what strsplit does since my teacher said he didn't know this function and therefore i could not use it. My code so far is
function [n_nos, graph] = Receber1( fich )
f = fopen(fich, 'r');
if f == -1
    disp('Insucesso ao abrir o ficheiro.');
else
    n_nos = 0;
    graph = [];
    while feof(f) == 0
        line = fgetl(f);
        graph(end+1, :) = str2double(strsplit(strtrim(line)));
        n_nos = n_nos+1;
    end
    fechar = fclose(f);
    if fechar == 0
        disp('Ficheiro carregado com sucesso.');
      else
          disp('Insucesso ao fechar o ficheiro.');
          n_nos = -1;
      end
  end
  end
Thank you so much.

Best Answer

The str2double(strsplit(strtrim(.))) is an overkill here, when a simple sscanf does the same already:
function [n_nos, graph] = Receber1( fich )
f = fopen(fich, 'r');
if f == -1  % IMPORTANT: Stop with an error
  error('Insucesso ao abrir o ficheiro: %s', fich);
end
n_nos = 0;
graph = [];
while feof(f) == 0
   line = fgetl(f);
   graph(end+1, :) = sscanf(line, '%f').';   [EDITED]
   n_nos = n_nos+1;
end
fclose(f);  % No test required
end
If the opening of the file fails, stopping with an error is the only secure reaction. Returning without defining the outputs will produce a strange and confusing error message instead.
General rule: Let the code stop in case of an error to avoid running the program in an undefined state with potentially unpredictable effects.
Closing the file can fail under extremely rare conditions only and will not produce any harm. Only if this happens about 250 times, Matlab cannot open files anymore, but this is detected by checking the -1 after fopen already.
Related Question