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cephes
cephes
round.c
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/* round.c
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*
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* Round double to nearest or even integer valued double
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*
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*
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*
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* SYNOPSIS:
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*
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* double x, y, round();
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*
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* y = round(x);
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*
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*
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*
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* DESCRIPTION:
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*
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* Returns the nearest integer to x as a double precision
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* floating point result. If x ends in 0.5 exactly, the
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* nearest even integer is chosen.
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*
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*
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*
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* ACCURACY:
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*
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* If x is greater than 1/(2*MACHEP), its closest machine
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* representation is already an integer, so rounding does
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* not change it.
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*/
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/*
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* Cephes Math Library Release 2.1: January, 1989
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* Copyright 1984, 1987, 1989 by Stephen L. Moshier
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* Direct inquiries to 30 Frost Street, Cambridge, MA 02140
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*/
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#include "
mconf.h
"
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double
round
(
double
x
)
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{
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double
y
, r;
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/* Largest integer <= x */
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y
=
floor
(
x
);
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/* Fractional part */
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r =
x
-
y
;
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/* Round up to nearest. */
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if
(r > 0.5)
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goto
rndup;
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/* Round to even */
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if
(r == 0.5) {
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r =
y
- 2.0 *
floor
(0.5 *
y
);
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if
(r == 1.0) {
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rndup:
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y
+= 1.0;
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}
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}
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/* Else round down. */
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return
(
y
);
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}
x
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Definition:
gnuplot_common_settings.hh:12
round
double round(double x)
Definition:
round.c:38
y
Scalar * y
Definition:
level1_cplx_impl.h:124
mconf.h
floor
const EIGEN_DEVICE_FUNC FloorReturnType floor() const
Definition:
ArrayCwiseUnaryOps.h:481
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Author(s):
autogenerated on Fri Nov 1 2024 03:35:00