MATLAB: Output rows of a matrix that meet a certain condition to a text file

matrix array

I have a matrix that looks like the following. I want to output all the rows to a text file that have a 5th column value greater than 10.

10 5 4 6 10

4 8 10 4 11

1 8 24 7 9

4 8 22 11 7

5 1 18 2 14

So the text file would look like

4 8 10 4 11

5 1 18 2 14

Best Answer

dlmwrite('mytextfile.txt',m(m(:,5)>10,:),'delimiter',' ') %where m is your given matrix

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MATLAB: How to format matrix data correctly in an output text file

I was just missing a couple of extra settings for dlmwrite

dlmwrite([folder '\' rename '.txt'], rawdata, 'delimiter', '\t', 'precision', 4, 'newline', 'pc');

MATLAB: Reading only numeric data in a text file

it's almays more complicated to read a file with no defined data structure.

In your case, you can use (and adjust for other files)

% read the file
fid = fopen('FrequencyShiftsV1.txt','r');
MyTextFile = textscan(fid,'%s','delimiter','\n');
fclose(fid);
MyTextFile = [MyTextFile{:}];
% get and evaluate the lines 2 and 3 (matlab expression).
eval(MyTextFile{2});
eval(MyTextFile{3});
% extract the part containg the matrix to read
MatrixLines = MyTextFile(7:end);
% get rid of Chirp1, Chirp2, ...
MatrixLines = regexprep(MatrixLines,'Chirp[^%d]','');
% Convet the char into a numerical matrix.
MyMatrix = str2num(cell2mat(MatrixLines));

Best Answer

Related Solutions

MATLAB: How to format matrix data correctly in an output text file

MATLAB: Reading only numeric data in a text file

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