p?rscl

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

Version

Public

p?rscl

Multiplies a vector by the reciprocal of a real scalar.

Syntax

voidpsrscl ( MKL_INT*n , float*sa , float*sx , MKL_INT*ix , MKL_INT*jx , MKL_INT*descx , MKL_INT*incx );

voidpdrscl ( MKL_INT*n , double*sa , double*sx , MKL_INT*ix , MKL_INT*jx , MKL_INT*descx , MKL_INT*incx );

voidpcsrscl ( MKL_INT*n , float*sa , MKL_Complex8*sx , MKL_INT*ix , MKL_INT*jx , MKL_INT*descx , MKL_INT*incx );

voidpzdrscl ( MKL_INT*n , double*sa , MKL_Complex16*sx , MKL_INT*ix , MKL_INT*jx , MKL_INT*descx , MKL_INT*incx );

Include Files

mkl_scalapack.h

Description

psrscl pdrscl pcsrscl pzdrscl The p?rscl routine function multiplies an n -element real/complex vector sub( X ) by the real scalar 1/ a . This is done without overflow or underflow as long as the final result sub( X )/a does not overflow or underflow.

sub( X ) denotes X(ix:ix+n-1, jx:jx) , if incx = 1 ,

and X(ix:ix, jx:jx+n-1) , if incx = m_x .

Input Parameters

n

(global)

The number of components of the distributed vector sub( X ). n ≥ 0 .

sa: REAL for psrscl/pcsrscl DOUBLE PRECISION for pdrscl/pzdrscl . The scalar a that is used to divide each component of the vector sub( X ). This parameter must be ≥ 0.
sx: REAL for psrscl DOUBLE PRECISION for pdrscl COMPLEX for pcsrscl COMPLEX*16 for pzdrscl . Array containing the local pieces of a distributed matrix of size of at least ((jx-1)*m_x + ix + (n-1)*abs(incx)) . This array contains the entries of the distributed vector sub( X ).

ix

(global) The row index of the submatrix of the distributed matrix X to operate on.

jx

(global)

The column index of the submatrix of the distributed matrix X to operate on.

descx

(global and local)

Array of size 9. The array descriptor for the distributed matrix X .

incx

(global)

The increment for the elements of X . This version supports only two values of incx , namely 1 and m_x .

Output Parameters

sx: On exit, the result x / a .

NOTE:

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Developer Reference for Intel® oneAPI Math Kernel Library for C

p?rscl

Syntax

Include Files

Description

Input Parameters

Output Parameters