MATLAB: Delete empty line in .dat file.

data importdelete empty text lineMATLAB

I have to import .dat file into matlab and there are thousands of empty lines (as shown in the attaced picture). I need to delete these lines. Annotation 2019-10-04 030249.png

Best Answer

filename = 'onetwo.dat';
outfilename = 'onetwo_slim.dat';
%read the content of the existing file
S = fileread(filename);
%remove extra sequential line terminators 
SS = regexprep(S, '(\r?\n)(\r?\n)*', '$1');
%write a new file from the result
fid = fopen(outfilename, 'w');
fwrite(fid, SS);
fclose(fid);

Related Solutions

MATLAB: How to change a specific line in a specific text file via matlab


filename = 'AppropriateFile.txt';
outfilename = 'Revised_File.txt';
LineToChange = 65;
NewContent = 'B 50';
S = fileread(filename);
SS = regexp(S, '\r?\n', 'split');
SS{LineToChange} = NewContent;
fid = fopen(outfilename, 'w');
fprintf(fid, '%s\n', SS{:});
fclose(fid);

It is not usually recommended ot make the output file name the same as the input file name: if you do that and there is a problem with the change, you could end up with the content of the file destroyed but the revised content not written into place. For example if there were an error in the fprintf() line, then the fopen() line right before that would already have discarded the existing content of the file, but the hypothetical error in the fprintf() would prevent the new content from being written in, and so the original content would be gone but the new content would not be there.

MATLAB: Concatenate data using fgets

You are closing the file in the loop. close the file after the loop. I assume the below should work.

function read_datapattern(filename)
fid = fopen(filename,'rt');
if fid < 0
  error('error opening file %s\n\n',filename);
end
pattern = fgets(fid);
for n = 1:32767
  nextline = fgets(fid);
  pattern = strcat(pattern, nextline);
fprintf(pattern);
fprintf('\n');
end
fclose(fid);

Best Answer

Related Solutions

MATLAB: How to change a specific line in a specific text file via matlab

MATLAB: Concatenate data using fgets

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