v?Mul

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

Syntax

Fortran:

call vsmul( n, a, b, y )

call vdmul( n, a, b, y )

call vcmul( n, a, b, y )

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

call vzmul( n, a, b, y )

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

vsMul( n, a, b, y );

vdMul( n, a, b, y );

vcMul( n, a, b, y );

vmcMul( n, a, b, y, mode );

vzMul( n, a, b, y );

vmzMul( n, a, b, y, mode );

Include Files

The FORTRAN 77 interfaces are specified in the mkl_vml.f77 include file, the Fortran 95 interfaces are specified in the mkl_vml.f90 include file, and the C interfaces are specified in the mkl_vml_functions.h include file.

Input Parameters

Name	Type	Description
n	FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: const int	Specifies the number of elements to be calculated.
a, b	FORTRAN 77: REAL for vsmul DOUBLE PRECISION for vdmul COMPLEX for vcmul, vmcmul DOUBLE COMPLEX for vzmul, vmzmul Fortran 90: REAL, INTENT(IN) for vsmul DOUBLE PRECISION, INTENT(IN) for vdmul COMPLEX, INTENT(IN) for vcmul, vmcmul DOUBLE COMPLEX, INTENT(IN) for vzmul, vmzmul C: const float* for vsMul const double* for vdMul const MKL_Complex8* for vcMul, vmcMul const MKL_Complex16* for vzMul, vmzMul	FORTRAN: Arrays that specify the input vectors a and b. C: Pointers to arrays that contain the input vectors a and b.
mode	FORTRAN 77: INTEGER8 Fortran 90:* INTEGER(KIND=8), INTENT(IN) C: const MKL_INT64	Overrides global VML mode setting for this function call. See SetMode for possible values and their description.

Name

Type

Description

FORTRAN 77: INTEGER

Fortran 90: INTEGER, INTENT(IN)

C: const int

Specifies the number of elements to be calculated.

a, b

FORTRAN 77: REAL for vsmul

DOUBLE PRECISION for vdmul

COMPLEX for vcmul, vmcmul

DOUBLE COMPLEX for vzmul, vmzmul

Fortran 90: REAL, INTENT(IN) for vsmul

DOUBLE PRECISION, INTENT(IN) for vdmul

COMPLEX, INTENT(IN) for vcmul, vmcmul

DOUBLE COMPLEX, INTENT(IN) for vzmul, vmzmul

C: const float* for vsMul

const double* for vdMul

const MKL_Complex8* for vcMul, vmcMul

const MKL_Complex16* for vzMul, vmzMul

FORTRAN: Arrays that specify the input vectors a and b.

C: Pointers to arrays that contain the input vectors a and b.

mode

FORTRAN 77: INTEGER*8

Fortran 90: INTEGER(KIND=8), INTENT(IN)

C: const MKL_INT64

Overrides global VML mode setting for this function call. See SetMode for possible values and their description.

Output Parameters

Name	Type	Description
y	FORTRAN 77: REAL for vsmul DOUBLE PRECISION for vdmul COMPLEX, for vcmul, vmcmul DOUBLE COMPLEX for vzmul, vmzmul Fortran 90: REAL, INTENT(OUT) for vsmul DOUBLE PRECISION, INTENT(OUT) for vdmul COMPLEX, INTENT(OUT) for vcmul, vmcmul DOUBLE COMPLEX, INTENT(OUT) for vzmul, vmzmul C: float* for vsMul double* for vdMul MKL_Complex8* for vcMul, vmcMul MKL_Complex16* for vzMul, vmzMul	FORTRAN: Array that specifies the output vector y. C: Pointer to an array that contains the output vector y.

Name

Type

Description

FORTRAN 77: REAL for vsmul

DOUBLE PRECISION for vdmul

COMPLEX, for vcmul, vmcmul

DOUBLE COMPLEX for vzmul, vmzmul

Fortran 90: REAL, INTENT(OUT) for vsmul

DOUBLE PRECISION, INTENT(OUT) for vdmul

COMPLEX, INTENT(OUT) for vcmul, vmcmul

DOUBLE COMPLEX, INTENT(OUT) for vzmul, vmzmul

C: float* for vsMul

double* for vdMul

MKL_Complex8* for vcMul, vmcMul

MKL_Complex16* for vzMul, vmzMul

FORTRAN: Array that specifies the output vector y.

C: Pointer to an array that contains 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 x1, x2, y1, y2 are finite numbers, but the real or imaginary part of the exact 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 VML Error Status to VML_STATUS_OVERFLOW.