Controlled conversion from double

Decodes each IEEE 754 double to its exact decimal value, then quantizes that value to the requested scale. This differs from parsing a character literal such as "0.1". Because the exact binary value of a double can require dozens of fractional digits, a scale must be given explicitly or configured with options(decimal.default_scale = ). Quantization uses the active context's rounding and trap settings.

Usage

decimal_from_double(x, scale = NULL)

Arguments

x

A double vector.

scale

An integer scalar giving the number of fractional digits to store, or NULL to use getOption("decimal.default_scale").

Value

A decimal vector.

Examples

decimal_from_double(0.1, scale = 20)
#> <decimal[1]>
#> [1] 0.10000000000000000555
decimal_from_double(c(0.5, 0.25), scale = 2)
#> <decimal[2]>
#> [1] 0.50 0.25