How do I set the exponential size in fprintf?

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I'm trying to get the fprintf command to output specifically with the e6 scientific notation size. Is this possible?
The function is:
function [ dv_km3 dv_m3 ] = r2dv( r )
%r2dv % this script converts radius values for a sphere (m)
% to volume (km3 and m3)
format long
dv_m3 = (4/3)*pi*r^3
% fprintf('dv_m3 = %d.e\n',dv_m3)
dv_km3 = dv_m3/(10^9)
% fprintf('dv_km3 = %d\n',dv_km3)
end
I would like the dv_m3 to output always as x10^6 (10e6)

Accepted Answer

Star Strider
Star Strider on 5 Aug 2015
One possibility:
x = rand(1,10) * 1E8;
xe6 = sprintf('%.3fE+6\n', x./1E6);
Experiment to get the result you want.
  2 Comments
MJackP
MJackP on 5 Aug 2015
Perfect, thanks for the mega-fast reply!
For anyone else using this, my code incorporating his answer is:
function [ dv_km3 dv_m3 ] = r2dv( r )
%r2dv % this script converts radius values for a sphere (m)
% to volume (km3 and m3)
dv_m3 = (4/3)*pi*r^3;
fprintf('dv_m3 = %.3fe+6\n',dv_m3./1E6)
dv_km3 = dv_m3/(10^9);
fprintf('dv_km3 = %.3f\n',dv_km3)
end

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