Reading data from a text file
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Hi everyone!
I have a data text file with the first four lines that look like this:
0 {1123 13.17 4.90 3.05} {1303 13.52 9.78 6.74}
1
2 {685 24.39 26.71 13.36}
3 {685 24.33 26.60 13.78} {1045 24.31 21.47 14.67}
The first line begins with "0" followed by two sets of data enclosed by {}
The second line begins with "1" with no sets of data
The third line begins with "2" with 1 set set of data enclosed with {}
Lastly, the fourth line begins with 3 with 2 sets of data within {}
I cannot use textscan to read this data file since the format varies in each line. What I would like to do is to make it like this
For each line, I should get n by 4 matrix where n is the number of data sets enclosed by {}. Therefore I plan to have a Matlab variable C such that for each line = k, I get
for k=line
for n=number of data sets enclosed by {}
C{1,k}(n,4)
end
end
As an example for C{1,1}, I should get a 2 by 4 matrix of the form
1123 13.17 4.90 3.05
1303 13.52 9.78 6.74
Please help me how to make this work.
Thanks,
Bry
采纳的回答
Hi Bry
This code should work just fine to do what you describe. It uses a regular expression at each line of the text file to match the "{1 2 3 4}" pattern:
fid = fopen('myFile.txt');
allMatches = cell(1000,1); % Just initialise to some large number
cellNo = 0;
tline = fgetl(fid);
while ischar(tline)
matchedStrs = regexp(tline, '\{[^\{]*\}','match');
if ~isempty(matchedStrs)
cellNo = cellNo + 1;
cellContents = cell2mat(cellfun(@(str)cell2mat(textscan(str,'{%f %f %f %f}',1)),matchedStrs','Un',0));
allMatches{cellNo} = cellContents;
end
tline = fgetl(fid);
end
fclose(fid);
allMatches = allMatches(1:cellNo); % Trim off the empty cells that we initialised
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