How to apply fprinf for matrix

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Ali
Ali 2016-5-27
评论： Ali 2016-5-27
I would like to use fprintf for Writing data to a text file. I want to apply fprintf on the following matrix. I have a matrix with n rows and 3 columns. please help with this issue. thanks a lot. for instance.
0.0000 0.0000 0.0000
0.0000 0.1000 0.0000
0.0643 0.0675 0.0000
0.1000 0.0000 0.0000
0.0000 0.2000 0.0000
0.2000 0.0000 0.0000
0.0725 0.1500 0.0000
0.1488 0.0873 0.0000
0.0726 0.2501 0.0000
0.0000 0.3000 0.0000
0.0000 0.4000 0.0000
0.3000 0.0000 0.0000
0.4000 0.0000 0.0000

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采纳的回答

Stephen23
Stephen23 2016-5-27
编辑：Stephen23 2016-5-27
This is MATLAB, so there really is no point in using an ugly loop when you can do it much faster and simpler with just one csvwrite call:
csvwrite('test.csv',M)
or with one fprintf call (no loop is required!):
M = [...
0.0000,0.0000,0.0000;...
0.0000,0.1000,0.0000;...
0.0643,0.0675,0.0000;...
0.1000,0.0000,0.0000;...
0.0000,0.2000,0.0000;...
0.2000,0.0000,0.0000;...
0.0725,0.1500,0.0000;...
0.1488,0.0873,0.0000;...
0.0726,0.2501,0.0000;...
0.0000,0.3000,0.0000;...
0.0000,0.4000,0.0000;...
0.3000,0.0000,0.0000;...
0.4000,0.0000,0.0000];
%
fid = fopen('test.csv','wt');
fprintf(fid,'%f,%f,%f\n',M.')
fclose(fid);

更多回答（3 个）

Stalin Samuel
Stalin Samuel 2016-5-27
%example code
s = rand(10,3);
fileID = fopen('a.txt','w');
for i=1:length(s)
fprintf(fileID,'%g\t%g\t%g \r\n',s(i,:));
end
fclose(fileID);
TastyPastry
TastyPastry 2016-5-27
fh = fopen('newFile.txt','w');
for i=1:size(myData,1)
fprintf(fh,'%d %d %d\n',a(i,1),a(i,2),a(i,3))
end
Guillaume
Guillaume 2016-5-27
Why not simply use dlmwrite?
dlmwrite('test.csv', M, 'delimiter', ' ');
or if you want to specify the precision
dlmwrite('test.csv', M, 'delimiter', ' ', 'precision', '%6.4f');

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