Unrecognized function or variable 'Fid2'.

The code works fine for single asterisk but for double asterisk error occurs. I have attached the code and output below.

CODE:

data='Demo 3.TXT';
FID=fopen(data,'rt');
numberoflines = 44;
for i=1:numberoflines
    l = fgetl(FID);
    if strcmp(l(1),'**')
        target = l(2:end);
        l = fgetl(FID);
        exist Fid2;
        if true(ans)
            fclose(Fid2);
        end
        Fid2 = fopen(target,'w');
    end
    fprintf(Fid2,[l '\n']);
end
close all

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Output:

Unrecognized function or variable 'Fid2'.

Error in untitled3 (line 16)

fprintf(Fid2,[l '\n']);

Answer 1

[Walter Roberson]

    l = fgetl(FID);
    if strcmp(l(1),'**')

fgetl returns a character vector (except at end of file)

l(1) will be a single character. A single character can never strcmp() to two characters.