v?MulByConj

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

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v?MulByConj

Performs element by element multiplication of vector a element and conjugated vector b element.

Syntax

call vcmulbyconj( n, a, b, y )

call vsmulbyconji(n, a, inca, b, incb, y, incy)

call vmcmulbyconj( n, a, b, y, mode )

call vmsmulbyconji(n, a, inca, b, incb, y, incy, mode)

call vzmulbyconj( n, a, b, y )

call vdmulbyconji(n, a, inca, b, incb, y, incy)

call vmzmulbyconj( n, a, b, y, mode )

call vmdmulbyconji(n, a, inca, b, incb, y, incy, mode)

Include Files

mkl_vml.f90

Input Parameters

Name	Type	Description
n	INTEGER, INTENT(IN)	Specifies the number of elements to be calculated.
a, b	DOUBLE COMPLEX for vzmulbyconj, vmzmulbyconj COMPLEX, INTENT(IN) for vcmulbyconj, vmcmulbyconj DOUBLE COMPLEX, INTENT(IN) for vzmulbyconj, vmzmulbyconj	Arrays that specify the input vectors a and b.
inca, incb, incy	INTEGER, INTENT(IN)	Specifies increments for the elements of `a`, `b`, and `y`.
mode	INTEGER(KIND=8), INTENT(IN)	Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name	Type	Description
y	DOUBLE COMPLEX for vzmulbyconj, vmzmulbyconj COMPLEX, INTENT(OUT) for vcmulbyconj, vmcmulbyconj DOUBLE COMPLEX, INTENT(OUT) for vzmulbyconj, vmzmulbyconj	Array that specifies the output vector y.

Name

Type

Description

DOUBLE COMPLEX for vzmulbyconj, vmzmulbyconj

COMPLEX, INTENT(OUT) for vcmulbyconj, vmcmulbyconj

DOUBLE COMPLEX, INTENT(OUT) for vzmulbyconj, vmzmulbyconj

Array that specifies the output vector y.

Description

The v?MulByConj function performs element by element multiplication of vector a element and conjugated vector b element.

Specifications for special values of the functions are found according to the formula

MulByConj(x1+i*y1,x2+i*y2) = Mul(x1+i*y1,x2-i*y2).

Overflow in a complex function occurs (supported in the HA/LA accuracy modes only) when all RE(x), RE(y), IM(x), IM(y) arguments are finite numbers, but the real or imaginary part of the computed result is so large that it does not fit the target precision. In this case, the function returns ∞ in that part of the result, raises the OVERFLOW exception, and sets the VM Error Status to VML_STATUS_OVERFLOW (overriding any possible VML_STATUS_ACCURACYWARNING status).

Parent topic: Arithmetic Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

v?MulByConj