ieeeround {ieeeround}

The ieeeround package

Description

These functions get and set the rounding mode for the floating point operations.

Usage

fegetround()
fesetround(rounding.mode = FE.TONEAREST)

FE.DOWNWARD
FE.UPWARD
FE.TOWARDZERO
FE.TONEAREST

Arguments

rounding.mode

The rounding mode to set. It should be one of FE.DOWNWARD, FE.UPWARD, FE.TOWARDZERO or FE.TONEAREST.

Details

The rounding mode determines how the result of floating-point operations is treated when the result cannot be exactly represented in the significand. Various rounding modes are provided: round to nearest (the default), round up (towards positive infinity), round down (towards negative infinity), and round towards zero.

fesetround(rounding.mode) sets the rounding mode and returns 0 if it was successfull, 1 otherwise.

fegetround() returns the current rounding mode.

Author(s)

Gianluca Amato [e-mail]

The fenv.3 Linux manpage maintainers

Examples

fesetround(FE.UPWARD)
x <- 1/5
fesetround(FE.DOWNWARD)
y <- 1/5
print(x-y > 0)
fesetround(FE.TONEAREST)