opening two files within a function

2013 5 29
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hello! i need to open two files within a function, but it doesn't work. i can open one file - no problem, but when i try to open an other it says:
??? Error using ==> fgetl at 44 Invalid file identifier. Use fopen to generate a valid file identifier.
Error in ==> fileopentest at 18 zahl = str2num(fgetl(fid2));
i've tried to close the first file, i've tried to use the full path of the second file, its allways the same message i get. can anybody please help?

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Walter Roberson
Walter Roberson 2013-5-29

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Use the two-output form of fopen:
[fid2, message2] = fopen(....);
if fid2 < 0
disp(['open #2 failed because: ', message2])
end

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Fedor
Fedor 2013-5-29
it says: open #2 failed because: No such file or directory thats strange, because the first file is in the same directory as the second and the first file opens.
Fedor
Fedor 2013-5-29
ok i figured it out, funny story: i was opening the second file with the name i've got from the first. so i wrote in my first file: 'File.dat' naturally the string i get from that is ''File.dat'' :D

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