Format exponent notation: start with 0

Question

Arjan Lampe 2021-4-29

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评论： dpb 2021-4-29

If I print a floating point f in exponential notation, I get, say:

>> sprintf('%10.3E',f)
ans =
    ' 2.091E+05'

Can Matlab always make the leading digit a zero, always, so:

>> sprintf('%someMagicHere',f)
ans =
    ' 0.209E+06'

I want this irrespective of the exponent.

(I know you print less significant digits this way)

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dpb 2021-4-29

Yes, that's what P multiplier does...changes the displayed scaled factor for the exponent.

dpb 2021-4-29

Yes, that's what P multiplier does...changes the displayed scaled factor for the exponent.

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Answer 1

Star Strider 2021-4-29

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在 MATLAB Online 中打开

I am not certain what you are asking.

I wrote a little utility function for my own use a while back to do something like this —

a=-0.07639297;
expstr = @(x,n) [x(:).*10.^(-n*floor(log10(abs(x(:)))/abs(n)))  n*floor(log10(abs(x(:)))/abs(n))];

Result_1 = sprintf('%+0.7fE%+04d', expstr(a,4))
Result_1 = '-763.9297000E-004'
Result_2 = sprintf('%+015.7fE%+04d', expstr(a,4))
Result_2 = '-000763.9297000E-004'

Putting a leading 0 in the format (just after the %) willl fill the numeric filed to the left of the decimal with leading zeros. See Optional Operators in the formatSpec section of the sprintf documentation.

Experiment with it to get the result you want.