v?Unpack

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

Version

Public

Copies elements of a vector with unit increment to an array with specified indexing.

vsUnpackI ( n , a , y , incy ) ;

vsUnpackV ( n , a , y , iy ) ;

vsUnpackM ( n , a , y , my ) ;

vdUnpackI ( n , a , y , incy ) ;

vdUnpackV ( n , a , y , iy ) ;

vdUnpackM ( n , a , y , my ) ;

vcUnpackI ( n , a , y , incy ) ;

vcUnpackV ( n , a , y , iy ) ;

vcUnpackM ( n , a , y , my ) ;

vzUnpackI ( n , a , y , incy ) ;

vzUnpackV ( n , a , y , iy ) ;

vzUnpackM ( n , a , y , my ) ;

Name	Type	Description
`n`	const MKL_INT	Specifies the number of elements to be calculated.
`a`	const float* for `vsUnpackI` , `vsUnpackV` , `vsUnpackM` const double* for `vdUnpackI` , `vdUnpackV` , `vdUnpackM` const MKL_Complex8* for `vcUnpackI` , `vcUnpackV` , `vcUnpackM` const MKL_Complex16* for `vzUnpackI` , `vzUnpackV` , `vzUnpackM`	Specifies the pointer to an array of size at least `n` that contains the input vector `a` .
`incy`	const MKL_INT for `vsUnpackI` , `vdUnpackI` , `vcUnpackI` , `vzUnpackI`	Specifies the increment for the elements of `y` .
`iy`	const int* for `vsUnpackV` , `vdUnpackV` , `vcUnpackV` , `vzUnpackV`	Specifies the pointer to an array of size at least `n` that contains the index vector for the elements of `a` .
`my`	const int* for `vsUnpackM` , `vdUnpackM` , `vcUnpackM` , `vzUnpackM`	Specifies the pointer to an array of size at least `n` that contains the mask vector for the elements of `a` .

Name	Type	Description
`y`	float* for `vsUnpackI` , `vsUnpackV` , `vsUnpackM` double* for `vdUnpackI` , `vdUnpackV` , `vdUnpackM` const MKL_Complex8* for `vcUnpackI` , `vcUnpackV` , `vcUnpackM` const MKL_Complex16* for `vzUnpackI` , `vzUnpackV` , `vzUnpackM`	Specifies the pointer to an array that contains the output vector `y` . The array must be: * for `v?UnpackI` , at least `(1 + (n-1)incy)` for `v?UnpackV` , at least `max( n,max(ia[j]) ),j=0,..., n-1` , * for `v?UnpackM` , at least `n` .