Question

I am working with Matlab code that writes coordinates to a text file as follows:

838959.41800,4713239.59000,1.00000,841305.41800,4708452.59000,1.00000,839175.41800,4712582.59000,1.00000

In the past, I’ve had to open each file individually and add the following to the first line of the .txt document:

x,y,z,
838959.41800,4713239.59000,1.00000,841305.41800,4708452.59000,1.00000,839175.41800,4712582.59000,1.00000

Any ideas on how to automate this process by embedding code which will write “x,y,z,” to the first line of the Matlab output?

Thanks much,

-Aaron

Answer 1

Here is an example:

x = rand(1,3);
y = rand(1,3);
z = rand(1,3);

fid = fopen('data.txt','wt');
fprintf(fid, 'x,y,z,\n');
fprintf([repmat('%.6f,',[1 8]) '%.6f\n'], x,y,z)
fclose(fid);

The output file:

data.txt

x,y,z,
0.694829,0.317099,0.950222,0.034446,0.438744,0.381558,0.765517,0.795200,0.186873