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iamax(3) LAPACK iamax(3)

NAME

iamax - iamax: argmax_i | real( x_i ) | + | imag( x_i ) |

SYNOPSIS

Functions


integer function icamax (n, cx, incx)
ICAMAX integer function idamax (n, dx, incx)
IDAMAX integer function isamax (n, sx, incx)
ISAMAX integer function izamax (n, zx, incx)
IZAMAX

Detailed Description

Function Documentation

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

ICAMAX

Purpose:



    ICAMAX finds the index of the first element having maximum |Re(.)| + |Im(.)|

Parameters

N 



          N is INTEGER


         number of elements in input vector(s)

CX



          CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )

INCX



          INCX is INTEGER


         storage spacing between elements of CX

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:



     jack dongarra, linpack, 3/11/78.


     modified 3/93 to return if incx .le. 0.


     modified 12/3/93, array(1) declarations changed to array(*)

integer function idamax (integer n, double precision, dimension(*) dx, integer incx)

IDAMAX

Purpose:



    IDAMAX finds the index of the first element having maximum absolute value.

Parameters

N 



          N is INTEGER


         number of elements in input vector(s)

DX



          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )

INCX



          INCX is INTEGER


         storage spacing between elements of DX

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:



     jack dongarra, linpack, 3/11/78.


     modified 3/93 to return if incx .le. 0.


     modified 12/3/93, array(1) declarations changed to array(*)

integer function isamax (integer n, real, dimension(*) sx, integer incx)

ISAMAX

Purpose:



    ISAMAX finds the index of the first element having maximum absolute value.

Parameters

N 



          N is INTEGER


         number of elements in input vector(s)

SX



          SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) )

INCX



          INCX is INTEGER


         storage spacing between elements of SX

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:



     jack dongarra, linpack, 3/11/78.


     modified 3/93 to return if incx .le. 0.


     modified 12/3/93, array(1) declarations changed to array(*)

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

IZAMAX

Purpose:



    IZAMAX finds the index of the first element having maximum |Re(.)| + |Im(.)|

Parameters

N 



          N is INTEGER


         number of elements in input vector(s)

ZX



          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )

INCX



          INCX is INTEGER


         storage spacing between elements of ZX

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:



     jack dongarra, 1/15/85.


     modified 3/93 to return if incx .le. 0.


     modified 12/3/93, array(1) declarations changed to array(*)

Author

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Tue Jan 14 2025 16:19:47 Version 3.12.0