Format exponent notation: start with 0
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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)
4 个评论
dpb
2021-4-29
Another example where C format string editing is hamstrung compared to Fortran -- there is no equivalent to the P Scale Factor Editing facility in C (and hence, not in MATLAB since it is based on the C fprintf i/o formatting library.
You'll have to manually scale the value as desired before printing.
Much would be far simpler if TMW had kept the Fortran FORMAT convention instead...
Arjan Lampe
2021-4-29
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.
回答（1 个）
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_2 = sprintf('%+015.7fE%+04d', expstr(a,4))
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.
2 个评论
Arjan Lampe
2021-4-29
Star Strider
2021-4-29
It depends on what you want to do. The examples posted originally had different exponents, and my utility function allows that to change.
The format descriptor syntax is the same, regardless. That is a property of sprintf, fprintf, and others (such as compose) that share that syntax.
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2021-4-29
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