MATLAB: Engineering Notation Printed Into Files

engineering notationfprintfMATLABsadist

It seems logical to me that it would be easy to print values out into a file using engineering notation for the exponents, but apparently I'm horribly mistaken. Does anyone know how to do this? I have been googling and looking at help files for 2 days now, and still can't figure it out. I'm thinking it has something to do with the output format on fprintf that was clearly designed by a sadist, but what that format is I can't tell by any of the literature on the subject…

Best Answer

(Corrected as per Jan's catch of my typo)

format long eng;
fwrite(fid, evalc('disp(YourVariable)'))

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MATLAB: Formating String Parameter Left of Decimal

I wrote a little utility function for my own purposes to do this a while ago:

engstr = @(x) [x*10.^(-3*floor(log10(abs(x))/3))  3*floor(log10(abs(x))/3)];    % Engineering Notation Mantissa & Exponent
x = 1E-4;
Result = sprintf('%3.0fE%-.0f', engstr(x))
Result =
    '100E-6'

Configure the sprintf format string to produce the output you want.

MATLAB: Format colorbar using engineering notation

Try this:

engstr = @(x) [x(:).*10.^(-3*floor(log10(abs(x(:)))/3))  3*floor(log10(abs(x(:)))/3)];
Q1 = logspace(-3, 3, 7);
Result2 = sprintfc('%.4fe%+04d', engstr(Q1))

Alternatively, use compose instead of sprintfc to create the tick labels for the color bar.

Experiment with the format string to get the result you want. This is just an example.

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