Using string() on double values without automatic rounding?

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Sondre
Sondre 2023-5-8
回答： Stephen23 2023-5-9
Hello,
When i use string() with double values, the number is converted to a string where the number is rounded to four decimals, even when there are more decimals in the original double value. Image:
I am currently writing a conversion script where i need the extra decimals. Is it possible to disable this automatic rounding?
Thank you.

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采纳的回答

Matt J
Matt J 2023-5-8
even when there are more decimals in the original double value
There are no more decimals in the original double value. A double value can only have 15 digits of precision.
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Matt J
Matt J 2023-5-8
编辑：Matt J 2023-5-8
Ran in:
You could use num2str,
string( num2str(123.123123123,'%.9f') )
ans = "123.123123123"

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Stephen23
Stephen23 2023-5-9
Ran in:
Rather than slow NUM2STR and then STRING, for a scalar the simpler and more efficient approach is to just call SPRINTF:
sprintf("%.9f",123.123123123)
ans = "123.123123123"
https://www.mathworks.com/help/matlab/ref/sprintf.html
For non-scalar values use COMPOSE:
https://www.mathworks.com/help/matlab/ref/compose.html

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