How can I skip some lines in a text file in order to reach a specific one which is in an undefined position?

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Antony Pranzetti
Antony Pranzetti 2017-9-26
回答： David Fink 2017-9-28
while message1 ~= message(1:size(message1,1),1:size(message1,2))
message1=fgetl(file_read); % move to the next cluster
i=i+1;
if message1 == -1
message = message1;
flag=0;
end
end
Hello everybody, I have this code line and my aim is to move the cursor down my text file unitl reaching the line stored in the variable "message". Previously on the code I had:
frewind(file_read);
for i=1:19;
message=fgetl(file_read);
end
Which worked fine because I knew the exact number of lines, but now I'm not able to move forward because, iteratively, matlab read always the same line (message1 remains the same).
How can I solve it?

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回答（1 个）

David Fink
David Fink 2017-9-28
Use 'fgetl' and 'isequal' to check each line against the specific one.
Consider the following text file 'find.txt', and the desired line is 'THIS TEXT':
not the
text
THIS TEXT
more text
Then the following MATLAB code will move the file cursor to the beginning of the line after 'THIS TEXT'.
>> f = fopen('find.txt');
>> message = '';
>> while ~isequal(message,'THIS TEXT')
>> message = fgetl(f);
>> end

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