Exponential precision of power engineering format

Question

Leandro de Oliveira 2018-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/396687-exponential-precision-of-power-engineering-format

回答： Harry Dymond 2020-5-31

Hello guys! I have the number 143903542.580052, by default matlab prints 1.439035e+08 but I want to print 143.9035e+06, I've tried so many matlab help links but nothing to do. Is there a way?

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Answer 1

Star Strider 2018-4-23

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在 MATLAB Online 中打开

For Command Window and ‘tooltip’ formatting, use:

format short eng

or:

format long eng

For printed output (using fprintf or sprintf), I wrote a little utility anonymous function for my own use to do that:

engntn = @(x) [x*10.^(-3*floor(log10(abs(x))/3))  3*floor(log10(abs(x))/3)];    % Engineering Notation Mantissa & Exponent
Result2 = sprintf('%.4fE%+04d', engntn(Q1))

for example:

Q1 =
          143903542.580052
Result2 =
    '143.9035E+006'

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Leandro de Oliveira 2018-4-23

Thank you, I hope Matlab implement some function like yours in the future.

Star Strider 2018-4-23

My pleasure.

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Answer 2

Harry Dymond 2020-5-31

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My FEX submission num2eng will do this for printed output. It handles edge cases such as Inf and NaN inputs, has extensive formatting control for the output, and offers the option of SI prefixes instead of engineering notation.