How can I properly format small numbers using num2str?

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Noam Ouzana 2021-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/1413237-how-can-i-properly-format-small-numbers-using-num2str

评论： Walter Roberson 2021-8-18

采纳的回答： David Hill

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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?

采纳的回答

David Hill 2021-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/1413237-how-can-i-properly-format-small-numbers-using-num2str#answer_768807

在 MATLAB Online 中打开

soly=num2str(y,'%.3E')
solx=num2str(x,'%.3E')

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Simon Chan 2021-8-18

Write a function which can change the display format based on the magnitude of the data.

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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