How to create a file .txt from a matrix?

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aya ben mabrouk
aya ben mabrouk 2016-6-19
评论： Muhammad Usman Saleem 2016-6-19
Hello everyone, I have a matrix x_training (size: 1000*2304) and another matrix y_training (size 1000*1) that contains labels of each instance in x_training. My goal is to create a file .txt that contain labels and x_training. there is a little example for simplification :
x_training=[0.2 0.3
0.5 0.4
0.5 0.9]
y_training=[1
2
3]
so, the file.txt will contain :
1 0.2 0.3
2 0.5 0.4
3 0.5 0.9
Please, help me, How can I do it? and thanks in advance

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采纳的回答

Rime
Rime 2016-6-19
编辑：Rime 2016-6-19
I think Adam's answer is right. What you need more is a loop:
fid = fopen( 'somefile.txt', 'w' );
for n=1:1000
fprintf( fid, '%d ', y_training(n));
for m=1:2304
fprintf( fid, '%.1f ', x_training(n,m));
end
fprintf(fid,'\n');
end
fclose(fid);
Let me know, if it doesn't work.

更多回答（2 个）

Adam
Adam 2016-6-19
编辑：Adam 2016-6-19
fid = fopen( 'somefile.txt', 'w' );
fprintf( fid, '%d %.1f %.1f\n', [y_training x_training ]');
would give what you want. You can change the format specifications to suit what you prefer.
  2 个评论
aya ben mabrouk
aya ben mabrouk 2016-6-19
it works for the little example, but as I said in the question, I work with matrix with size 1000*2304 et 1000*1. it dosen't work in this case. what is the problem?
Adam
Adam 2016-6-19
I don't know. What is the problem? I don't have an example matrix of the size you say to test with, but you have obviously tried it so you know better than me what the problem is.

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Muhammad Usman Saleem
Hi, I hope you are fine
You can create a matrix data of which the first column is of y_training and 2:end ,columns are x_training?
Please try and tell me if not working
data=[y_training x_training(:,1:2304)] %based on your matrix
fId = fopen( 'your file.txt', 'w' ) ;
fprintf( fId, '%i %2.1f %2.1f \r\n', data(:) ) ; % update this line
fclose( fId ) ;
As i have not your matrixes that why here is the demo of testing this code
a=rand(1000,2304); % creating randomly 1000*2304 matrix as x_training
b=rand(1000,1); % creating randomly 1000*1 matrix as y_training
c=[b a(:,1:end)];
data=c;
fId = fopen( 'your file.txt', 'w' ) ;
fprintf( fId, '%i %2.1f %2.1f \r\n', data(:) ) ;
fclose( fId ) ;
sample output text file i obtain
8.985058e-01 0.1 0.3
9.572001e-01 1.0 0.6
7.864674e-01 0.6 0.4
8.036594e-01 1.0 0.6
7.004861e-01 0.3 0.8
2.858565e-01 0.5 0.9
1.721007e-02 0.9 0.9
8.984719e-01 0.9 0.3
3.485380e-01 1.0 1.0
3.902574e-02 0.8 0.4
6.243073e-01 0.8 0.8
1.473974e-01 0.2 0.2
8.838331e-01 0.9 0.5
8.072159e-01 0.4 0.4
1.996930e-01 0.2 0.3
5.608404e-01 0.6 0.3
3.858926e-02 0.0 0.2
9.515419e-01 0.9 0.0
7.501847e-01 0.5 0.4
3.773373e-01 0.1 0.3
6.825213e-01 0.6 0.5
2.274023e-01 0.2 0.3
2.509858e-01 0.4 1.0
2.334426e-01 0.3 0.6
9.447222e-01 0.9 0.7
8.488192e-01 0.2 0.7
3.411729e-01 0.5 0.7
3.744066e-01 0.8 0.3
6.405010e-01 0.4 0.8
7.717461e-01 0.1 0.9
6.768452e-01 0.8 0.8
3.722052e-01 0.3 0.9
1.738441e-01 0.5 0.8
9.710438e-01 0.3 0.3
3.967397e-01 0.6 0.5
2.772546e-01 0.4 0.5
9.171816e-01 0.4 0.8
3.136884e-01 0.6 0.8
5.080256e-01 0.0 0.4
  1 个评论
Muhammad Usman Saleem
Muhammad Usman Saleem 2016-6-19
try this also
data=[y_training x_training(:,1:2304)] %based on your matrix
dlmwrite('myFile.txt', data);
Text file size is very long that why can not attached with this comment. Tell me which method is giving you correct output?

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