MATLAB: Hi. There a text file with many lines and the professor asked me to extract from this text file in a matrix just the lines which contains the word GPS10.he suggested me use fgetl and while lope. Could you please help me

fgetltext file

filename=uigetfile;
fid=fopen('sp3data.txt');

Best Answer

    fid = fopen('sp3data.txt');
    tline = fgetl(fid);
    while ischar(tline)
        disp(tline)
        tline = fgetl(fid)
    end
    fclose(fid);

Read about contains , strcmp, strfind etc..to check whether your desired string is present in the line...and save them .

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The best solution is probably to read your entire file as text, then remove the header lines, then parse them with textscan.

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As shown in the help:

fid = fopen('fgetl.m');
tline = fgetl(fid);
while ischar(tline)
    disp(tline)
    tline = fgetl(fid);
end
fclose(fid);

Now just modify that to open 2 files, and add a line counter then break after you've transferred x of them (untested)

fin = fopen('input.txt');
fout = fopen('output.txt', 'wt');
tline = fgetl(fin);
count = 0;
while ischar(tline) && count < x
    disp(tline)
    tline = fgetl(fin);
    if ischar(tline)
        fprintf(fout, '%s\n', tline);
    end
    count = count + 1;
end
fclose(fin);
fclose(fout);

Best Answer

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