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Get one line from file

32 次查看（过去 30 天）
bart
bart 2011-4-20
Hey,
I have a problem with extracting information from a textfile. The information I need is only on one line. I know which line it is, but how can I read it from the textfile easily? I've allready considered the command 'fgets', but this only takes the first line of the file, right?.

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回答（5 个）

Walter Roberson
Walter Roberson 2011-4-20
For further certainty: neither fgets() nor fgetl() have any mechanism for positioning to a particular line. Something has to specifically count the lines.
A short-cut is to use
textscan(fid, '%[^\n]', 1, 'HeaderLines', N)
this will do the counting for you.
Jennifer
Jennifer 2011-4-20
Try using something like:
load file.txt
% Create variable
% edit number of rows as needed
var= file(1:10,1);
In the example above we are reading the first 10 rows or column 1.
Hope this helps
Robert Cumming
Robert Cumming 2011-4-20
or you could use
fid = fopen ( 'file.txt' )
if fid ~= -1
for i=1:NUMBER_OF_LINES_TO_SKIP
fgetl ( fid );
end
yourLine = fgetl ( fid );
fclose ( fid );
end
bart
bart 2011-4-20
Thanks for answering the question! I never expected to get an answer so quickly! greets, Bart
bart
bart 2011-4-21
OK, thanks.

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