How can I properly format small numbers using num2str?

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Noam Ouzana
Noam Ouzana 2021-8-17
评论： Walter Roberson 2021-8-18
Ran in:
I was assigned to work on the aesthetics of a table that shows collected data as string.
I want to show the numbers with 4 digits percision, but whenever the number is bigger the 10e-5, the output will include all the zeros, and only the four digits, e.g:
x=0.000123456;
y=0.0000123456;
solx=num2str(x,'%.4G');
soly=num2str(y,'%.4G');
solx
solx = '0.0001235'
soly
soly = '1.235E-05'
Is there any way that I can get solx to be formatted like soly?

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采纳的回答

David Hill
David Hill 2021-8-17
soly=num2str(y,'%.3E')
solx=num2str(x,'%.3E')
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Simon Chan
Simon Chan 2021-8-18
Write a function which can change the display format based on the magnitude of the data.
Walter Roberson
Walter Roberson 2021-8-18
Simon is correct.
The only conditional formatting that MATLAB supplies in any released version, is what is done automatically by "format short" or "format long", or done by a %g format for sprintf() or fprintf() or compose() -- none of which permit tuning the boundaries of when values are to be shown in which varient.

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