Rmpfr: roundMpfr – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

roundMpfr

Rounding to Binary bits, "mpfr-internally"

Description

Rounding to binary bits, not decimal digits. Closer to the number representation, this also allows to increase or decrease a number's precBits. In other words, it acts as setPrec(), see getPrec().

Usage

roundMpfr(x, precBits, rnd.mode = c("N","D","U","Z","A"))

Arguments

`x`	an mpfr number (vector)
`precBits`	integer specifying the desired precision in bits.
`rnd.mode`	a 1-letter string specifying how rounding should happen at C-level conversion to MPFR, see `mpfr`.

Value

an mpfr number as x but with the new 'precBits' precision

Examples

(p1 <- Const("pi", 100)) # 100 bit prec
 roundMpfr(p1, 120) # 20 bits more, but "random noise"
 Const("pi", 120)   # same "precision", but really precise

Rmpfr

R MPFR - Multiple Precision Floating-Point Reliable

v0.8-4

GPL (>= 2)

Authors

Martin Maechler [aut, cre] (<https://orcid.org/0000-0002-8685-9910>), Richard M. Heiberger [ctb] (formatHex(), *Bin, *Dec), John C. Nash [ctb] (hjkMpfr(), origin of unirootR()), Hans W. Borchers [ctb] (optimizeR(*, "GoldenRatio"); origin of hjkMpfr())

Initial release

2021-04-08