Intel® Math Kernel Library 2019 Developer Reference - Fortran
Performs element by element multiplication of vector a element and conjugated vector b element.
call vcmulbyconj( n, a, b, y )
call vmcmulbyconj( n, a, b, y, mode )
call vzmulbyconj( n, a, b, y )
call vmzmulbyconj( n, a, b, y, mode )
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. |
mode |
INTEGER(KIND=8), INTENT(IN) |
Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description. |
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. |
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 x1, x2, y1, y2 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).