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[;1m-spec float_to_list(Float, Options) -> string()[0m
[;1m when[0m
[;1m Float :: float(),[0m
[;1m Options :: [Option],[0m
[;1m Option ::[0m
[;1m {decimals, Decimals :: 0..253} |[0m
[;1m {scientific, Decimals :: 0..249} |[0m
[;1m compact | short.[0m
[;;4mSince[0m:
OTP R16B
Returns a string corresponding to the text representation of [;;4m[0m
[;;4mFloat[0m using fixed decimal point formatting.
Available options:
• If option [;;4mdecimals[0m is specified, the returned value
contains at most [;;4mDecimals[0m number of digits past the
decimal point. If the number does not fit in the internal
static buffer of 256 bytes, the function throws [;;4mbadarg[0m.
• If option [;;4mcompact[0m is specified, the trailing zeros at the
end of the list are truncated. This option is only
meaningful together with option [;;4mdecimals[0m.
• If option [;;4mscientific[0m is specified, the float is formatted
using scientific notation with [;;4mDecimals[0m digits of
precision.
• If option [;;4mshort[0m is specified, the float is formatted with
the smallest number of digits that still guarantees that [;;4mF[0m
[;;4m=:= list_to_float(float_to_list(F, [short]))[0m. When the
float is inside the range (-2⁵³, 2⁵³), the notation that
yields the smallest number of characters is used (scientific
notation or normal decimal notation). Floats outside the
range (-2⁵³, 2⁵³) are always formatted using scientific
notation to avoid confusing results when doing arithmetic
operations.
• If [;;4mOptions[0m is [;;4m[][0m, the function behaves as [;;4m[0m
[;;4mfloat_to_list/1[0m.
Examples:
> float_to_list(7.12, [{decimals, 4}]).
"7.1200"
> float_to_list(7.12, [{decimals, 4}, compact]).
"7.12"
> float_to_list(7.12, [{scientific, 3}]).
"7.120e+00"
> float_to_list(7.12, [short]).
"7.12"
> float_to_list(0.1+0.2, [short]).
"0.30000000000000004"
> float_to_list(0.1+0.2)
"3.00000000000000044409e-01"
In the last example, [;;4mfloat_to_list(0.1+0.2)[0m evaluates to [;;4m[0m
[;;4m"3.00000000000000044409e-01"[0m. The reason for this is explained in
Representation of Floating Point Numbers.
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