v?Mul

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

Download PDF

ID 766686

Date 4/28/2026

Version

Public

v?Mul

vsMul vmsMul vdMul vmdMul vcMul vmcMul vzMul vmzMul Performs element by element multiplication of vector a and vector b .

Syntax

call vsmul ( n , a , b , y )

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

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

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

call vdmul ( n , a , b , y )

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

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

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

call vcmul ( n , a , b , y )

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

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

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

call vzmul ( n , a , b , y )

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

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

call vmzmuli(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 PRECISION for `vdmul` , `vmdmul`Fortran 77: COMPLEX for `vcmul` , `vmcmul`Fortran 77: DOUBLE COMPLEX for `vzmul` , `vmzmul`Fortran 90: REAL , INTENT(IN) for `vsmul` , `vmsmul`Fortran 90: DOUBLE PRECISION , INTENT(IN) for `vdmul` , `vmdmul`Fortran 90: COMPLEX , INTENT(IN) for `vcmul` , `vmcmul`Fortran 90: DOUBLE COMPLEX , INTENT(IN) for `vzmul` , `vmzmul`	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 PRECISION for `vdmul` , `vmdmul`Fortran 77: COMPLEX , for `vcmul` , `vmcmul`Fortran 77: DOUBLE COMPLEX for `vzmul` , `vmzmul`Fortran 90: REAL , INTENT(OUT) for `vsmul` , `vmsmul`Fortran 90: DOUBLE PRECISION , INTENT(OUT) for `vdmul` , `vmdmul`Fortran 90: COMPLEX , INTENT(OUT) for `vcmul` , `vmcmul`Fortran 90: DOUBLE COMPLEX , INTENT(OUT) for `vzmul` , `vmzmul`	Array that specifies the output vector `y` .

Description

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

Special values for Real Function v?Mul(x)

Argument 1	Argument 2	Result	Exception
+0	+0	+0
+0	-0	-0
-0	+0	-0
-0	-0	+0
+0	∞	QNAN	INVALID
+0	∞	QNAN	INVALID
-0	∞	QNAN	INVALID
-0	∞	QNAN	INVALID
∞	+0	QNAN	INVALID
∞	-0	QNAN	INVALID
∞	+0	QNAN	INVALID
∞	-0	QNAN	INVALID
∞	∞	∞
∞	∞	∞
∞	∞	∞
∞	∞	∞
SNAN	any value	QNAN	INVALID
any value	SNAN	QNAN	INVALID
QNAN	non-SNAN	QNAN
non-SNAN	QNAN	QNAN

Specifications for special values of the complex functions are defined according to the following formula

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

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).

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

v?Mul

Syntax

Include Files

Input Parameters

Output Parameters

Description