v?MulByConj

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

Version

Public

v?MulByConj

vcMulByConj vmcMulByConj vzMulByConj vmzMulByConj 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`	Fortran 77: DOUBLE COMPLEX for `vzmulbyconj` , `vmzmulbyconj`Fortran 90: COMPLEX , INTENT(IN) for `vcmulbyconj` , `vmcmulbyconj`Fortran 90: 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 (Sets a new mode for VM functions according to the mode parameter and stores the previous VM mode to oldmode.) for possible values and their description.

Output Parameters

Name	Type	Description
`y`	Fortran 77: DOUBLE COMPLEX for `vzmulbyconj` , `vmzmulbyconj`Fortran 90: COMPLEX , INTENT(OUT) for `vcmulbyconj` , `vmcmulbyconj`Fortran 90: 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).

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

v?MulByConj

Syntax

Include Files

Input Parameters

Output Parameters

Description