Creating .txt file with matlab

Hey everyone.

I have a function that analyses an image and returns numerical values about it in several variabels.

Imagine I run my code and have the following data

a1=2; a2=4; a3=0; a4=8;

now I want my code to write this values in a .txt in the following way: 2,4,0,8

I want to be capable of analysing several images in the folder and to keep all the results in the same .txt file, with all the values separated by commas.

Thanks in advance!

Answer 1

[Geoff]

This opens the file once (overwriting if it already exists) and writes your results one line at a time.

fid = fopen( 'results.txt', 'wt' );
for image = 1:N
  [a1,a2,a3,a4] = ProcessMyImage( image );
  fprintf( fid, '%f,%f,%f,%f\n', a1, a2, a3, a4);
end
fclose(fid);

Alternatively, you could open the file in 'append' mode, write the line, and close it again each time through the loop.

doc fopen

[Charles Miller]

Okay, but how do you CREATE the file to output to?

[Carlos José]

This code already creates one txt file...

you can see it better using this code (try it on your matlab):

b = [65 66 67 68 69];

criptografia = char(b);

fid = fopen('output.txt','wb');

fwrite(fid, criptografia, 'char');

fclose(fid);

[Huy Le Van]

Hi.

how do you write file .txt ? in here we have those space .

Answer 2

[David Fernández]

Thanks! Simple, usefull.