Using string() on double values without automatic rounding?
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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.
采纳的回答
Matt J
2023-5-8
0 个投票
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.
3 个评论
I'm not sure im following? If I understand correctly, a double value can have 15 decimal places of precision. Even with numbers with less than 15 digits in total the problem is still there:
Meaning that the string() function rounds to four decimals. My question is wether it is possible to do this double->string conversion without this rounding.
I hope i have made myself more clear, sorry if my initial formulation was off.
Sondre
2023-5-8
更多回答（1 个）
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)
For non-scalar values use COMPOSE:
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