How do I set the exponential size in fprintf?

Question

MJackP 2015-8-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/232496-how-do-i-set-the-exponential-size-in-fprintf

评论： Star Strider 2015-8-5

采纳的回答： Star Strider

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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)

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Answer 1

Star Strider 2015-8-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/232496-how-do-i-set-the-exponential-size-in-fprintf#answer_188352

在 MATLAB Online 中打开

One possibility:

x = rand(1,10) * 1E8;
xe6 = sprintf('%.3fE+6\n', x./1E6);

Experiment to get the result you want.

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MJackP 2015-8-5

在 MATLAB Online 中打开

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