MATLAB: Read and search using Textscan

textscan

Hi,
I am reading a long text file using:
fid = fopen('C:\Users\dy4.txt');
s = textscan(fid,'%s');
and I get s 1×1 cell which if I click it I get s{1,1} 120×1 cell, Therefore I have two questions:
– How can I read it to avoid this “cell in cell”?
– The file structure is like that:
10.00000 33.00000
162.00000 55.00000
141.00000 53.00000
1383.00000 39.00000
1565.00000 16.00000
IM=1.jpg
10.00000 83.00000
122.00000 515.00000
121.00000 505.00000
1583.00000 33.00000
1865.00000 46.00000
IM=2.jpg
...
How can I scan the stored cell so I can only output the IM line?
Thanks

Best Answer

1. You can't. Simply write:
c = textscan(fid,'%s');
s = c{1};
2. strncmp:
lineIndex = strncmp(s, 'IM=', 3);  % Or; find(strncmp(...))
matchLine = s(lineIndex);
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