v?InvSqrt

Computes an inverse square root of vector elements.

Syntax

vsInvSqrt( n, a, y );

vsInvSqrtI(n, a, inca, y, incy);

vmsInvSqrt( n, a, y, mode );

vmsInvSqrtI(n, a, inca, y, incy, mode);

vdInvSqrt( n, a, y );

vdInvSqrtI(n, a, inca, y, incy);

vmdInvSqrt( n, a, y, mode );

vmdInvSqrtI(n, a, inca, y, incy, mode);

Name	Type	Description
n	const MKL_INT	Specifies the number of elements to be calculated.
a	const float* for vsInvSqrt, vmsInvSqrt const double* for vdInvSqrt, vmdInvSqrt	Pointer to an array that contains the input vector a.
inca, incy	const MKL_INT	Specifies increments for the elements of `a` and `y`.
mode	const MKL_INT64	Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Name	Type	Description
y	float* for vsInvSqrt, vmsInvSqrt double* for vdInvSqrt, vmdInvSqrt	Pointer to an array that contains the output vector y.

Name

Type

Description

float* for vsInvSqrt, vmsInvSqrt

double* for vdInvSqrt, vmdInvSqrt

Pointer to an array that contains the output vector y.

The v?InvSqrt function computes an inverse square root of vector elements.

Special Values for Real Function v?InvSqrt(x)
Argument	Result	VM Error Status	Exception
X < +0	QNAN	VML_STATUS_ERRDOM	INVALID
+0	+∞	VML_STATUS_SING	ZERODIVIDE
-0	-∞	VML_STATUS_SING	ZERODIVIDE
-∞	QNAN	VML_STATUS_ERRDOM	INVALID
+∞	+0
QNAN	QNAN
SNAN	QNAN		INVALID