control when to use exponential notation in num2str

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James Johnson
James Johnson 2020-1-3
回答： Walter Roberson 2020-1-3
I would like to control when exponential notation is used vs when it is not for compact exponential notation in matlab.
For example.
num2str([0.0077;0.324;0.0000435],'%2.4G')
gives
' 0.0077'
' 0.324'
'4.35E-05'
but I want it to give
' 7.7E-03'
' 0.324'
'4.35E-05'
I'm aware of using the "E" notation to alway force exponential notation but I do not like the trailing zeros. I want to be able to specify that anything below 10^-2 should use compact exponential format. I suspect that it is an undocumented element of format spec.
Currently I have this nasty work around.
matlab_workaround=0.0077
if log10(matlab_workaround)<-2;
matlab_workaround=num2str(matlab_workaround,'%2.4E');
while contains(matlab_workaround,'0E')
matlab_workaround=strrep(matlab_workaround,'0E','E');
end
else
matlab_workaround=num2str(matlab_workaround,'%2.4G');
end

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回答（1 个）

Walter Roberson
Walter Roberson 2020-1-3
There is no control over conversion other than the format specification the way you are passing it in.
Note: num2str() uses sprintf() (or possibly sprintfc()), so it has the same restrictions that sprintf() has -- which is to say that it is not possible to customize the details of %g conversion.

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