v?Sub

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

Version

Public

v?Sub

Performs element by element subtraction of vector b from vector a .

Syntax

call vssub ( n , a , b , y )

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

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

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

call vdsub ( n , a , b , y )

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

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

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

call vcsub ( n , a , b , y )

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

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

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

call vzsub ( n , a , b , y )

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

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

call vmzsubi(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 `vdsub` , `vmdsub`Fortran 77: COMPLEX for `vcsub` , `vmcsub`Fortran 77: DOUBLE COMPLEX for `vzsub` , `vmzsub`Fortran 90: REAL , INTENT(IN) for `vssub` , `vmssub`Fortran 90: DOUBLE PRECISION , INTENT(IN) for `vdsub` , `vmdsub`Fortran 90: COMPLEX , INTENT(IN) for `vcsub` , `vmcsub`Fortran 90: DOUBLE COMPLEX , INTENT(IN) for `vzsub` , `vmzsub`	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: REAL for `vssub` , `vmssub`Fortran 77: DOUBLE PRECISION for `vdsub` , `vmdsub`Fortran 77: COMPLEX for `vcsub` , `vmcsub`Fortran 77: DOUBLE COMPLEX for `vzsub` , `vmzsub`Fortran 90: REAL INTENT(OUT) for `vssub` , `vmssub`Fortran 90: DOUBLE PRECISION , INTENT(OUT) for `vdsub` , `vmdsub`Fortran 90: COMPLEX , INTENT(OUT) for `vcsub` , `vmcsub`Fortran 90: DOUBLE COMPLEX , INTENT(OUT) for `vzsub` , `vmzsub`	Array that specifies the output vector `y` .

Description

The v?Sub function performs element by element subtraction of vector b from vector a .

Special values for Real Function v?Sub(x)

Argument 1	Argument 2	Result	Exception
+0	+0	+0
+0	-0	+0
-0	+0	-0
-0	-0	+0
∞	∞	QNAN	INVALID
∞	∞	∞
∞	∞	∞
∞	∞	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

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

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?Sub

Syntax

Include Files

Input Parameters

Output Parameters

Description