how to search for a string inside a file in matlab

to search a word inside a .dat file to read data under that line

[Jan]

It depends on the format of the .dat file. There is no standard for this file type, so we cannot guess the details.

Answer 1

[Jan]

Guessed, tha the .dat file is a text file and you want to search fpr the occurence of a string anywhere in a line:

fid = fopen(FileName, 'r');
if fid == -1
  error('Cannot open file: %s', FileName);
end

key    = 'YourStr';
data   = 'not found';
ready  = false;
lineNo = 0;   % [EDITED]
while ~eof(fid) && ~ready
  S = fgetl(fid);
  lineNo = lineNo + 1;   % [EDITED]
  if any(strfind(S, key))
    data  = YourReadMethod;
    ready = true;
  end
end
fclose(fid);

[lafnath p]

how to get line number of searched string

[Image Analyst]

Put a line counter variable inside the loop that you increment.

[Jan]

@lafnath p: See [EDITED] in the code. You see, it is not complicated.