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imax1(3) LAPACK imax1(3)

NAME

imax1 - imax1: argmax_i | x_i | (in LAPACK)

SYNOPSIS

Functions


integer function icmax1 (n, cx, incx)
ICMAX1 finds the index of the first vector element of maximum absolute value. integer function izmax1 (n, zx, incx)
IZMAX1 finds the index of the first vector element of maximum absolute value.

Detailed Description

Function Documentation

integer function icmax1 (integer n, complex, dimension(*) cx, integer incx)

ICMAX1 finds the index of the first vector element of maximum absolute value.

Purpose:



 ICMAX1 finds the index of the first vector element of maximum absolute value.


 Based on ICAMAX from Level 1 BLAS.


 The change is to use the 'genuine' absolute value.

Parameters

N 



          N is INTEGER


          The number of elements in the vector CX.

CX



          CX is COMPLEX array, dimension (N)


          The vector CX. The ICMAX1 function returns the index of its first


          element of maximum absolute value.

INCX



          INCX is INTEGER


          The spacing between successive values of CX.  INCX >= 1.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Contributors:

Nick Higham for use with CLACON.

integer function izmax1 (integer n, complex*16, dimension(*) zx, integer incx)

IZMAX1 finds the index of the first vector element of maximum absolute value.

Purpose:



 IZMAX1 finds the index of the first vector element of maximum absolute value.


 Based on IZAMAX from Level 1 BLAS.


 The change is to use the 'genuine' absolute value.

Parameters

N 



          N is INTEGER


          The number of elements in the vector ZX.

ZX



          ZX is COMPLEX*16 array, dimension (N)


          The vector ZX. The IZMAX1 function returns the index of its first


          element of maximum absolute value.

INCX



          INCX is INTEGER


          The spacing between successive values of ZX.  INCX >= 1.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Contributors:

Nick Higham for use with ZLACON.

Author

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Tue Jan 28 2025 00:54:31 Version 3.12.0