write to file in exponential notation

Iam writing a variable r to file using the following code

      r= [0.000452403093670532  0.000445718222208873];
      str='test.txt';
      str1=['r =',mat2str(r)];
      dlmwrite(str,str1,'-append', 'delimiter', '', 'precision','%-6.6e','newline', 'pc');

but no matter how I try always write it in decimal notation. I want to write it in exponential notation somenthing like

r= [4.524e-4  4.457e-4];

any help will be grately appreciated!!

Answer 1

[Matt Fig]

Try FPRINTF instead of DLMWRITE.

[Maider Marin]

I try this one but the formating was not easy, since I need in the file

r=[ 1st value 2nd value] and then I got r=[ 1st value r=[ 2nd value I guest I could work it out but I did not see it right away

Answer 2

[bym]

how about

strl = sprintf('r = %5.4e  %5.4e ',r)

[Maider Marin]

The problem is that the real r has 2400 entries, and I do not think I can do that with this

Answer 3

[Maider Marin]

Iam writing a variable r to file using the following code

      r= [0.000452403093670532  0.000445718222208873];
      str='test.txt';
      str1=['r =',mat2str(r)];
      dlmwrite(str,str1,'-append', 'delimiter', '', 'precision','%-6.6e','newline', 'pc');

I think I figure it out. The problem is with mat2str(r) I am not specifiying format, so it takes the original format and when I use dlmwrite that format does not work because it is already a string. I redo the code I got something like

      r= [0.000452403093670532  0.000445718222208873];
      str='test.txt';
      str1=['r =',num2str(r,'%6.3e\t\t')];
      dlmwrite(str,str1,'-append', 'delimiter', '','newline', 'pc');

Thanks for your answers