how to print E formated numbers.

7 views (last 30 days)
I have numbers such as 0.1032E-02 (say) If I read this as x = 0.1032E-02 and save it to a text file using fopen, and fprintf fid = fopen('Testing.txt','wt'); fprintf(fid, '%15.5E\n',x) it always prints x as 1.032E-03 but I would like the 0 in front just as the way I assigned the value to x. How do i do it?
  2 Comments
Stephen23
Stephen23 on 8 Mar 2018
Edited: Stephen23 on 8 Mar 2018
@Pappu Murthy: Numeric data classes do not store any formatting, so printing a number "just as the way I assigned the value to x" is not possible in general: a value will simply be displayed according to the fprintf specification. With that in mind: if you need to convert to numeric, do you always want a leading zero in the printed output?
Pappu Murthy
Pappu Murthy on 8 Mar 2018
Yes. I want the numbers printed as 0.0000E-nn format with leading zero. But fprintf does not let the leading zero.

Sign in to comment.

Accepted Answer

Star Strider
Star Strider on 8 Mar 2018
Try this little utility anonymous function I wrote a while back to solve this exact problem:
a = 0.1032E-02
expstr = @(x) [x*10.^floor(-log10(abs(x))) floor(log10(abs(x))+1)];
Result = sprintf('%.7fE%+03d', expstr(a))
Result =
'0.1032000E-02'
  5 Comments
Pappu Murthy
Pappu Murthy on 8 Mar 2018
It worked like charm. I am going to use this now. Thanks for all the help.
Star Strider
Star Strider on 8 Mar 2018
As always, my (our) pleasure!

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!