format numbers in txt

   R2=R;
   R2(R2==2) = 0.25;
   R2(R2==1) = 0.15;
   fid = fopen('porosity.txt','wt');

   if fid > 0
       fprintf(fid,'%d\n',R2');
       fclose(fid);
   end

When I write the array to a txt file, the format of the values change. From 0.15 to 1.500000e-01 How to keep the initial format 0.15 ?

Thank you.

Answer 1

[Star Strider]

The ‘%d’ format descriptor writes integers, and since ‘0.15’ is not an integer, it defaults to an exponential format.

Try this:

fprintf(fid,'%.2f\n',R2');

The ‘%f’ format descriptor writes either fixed-width or variable-width floating point numbers, depending on what you want. See the documentation on fprintf for details.