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aux_blas(3) LAPACK aux_blas(3)

NAME

aux_blas

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 logical function lsame (CA, CB)
LSAME subroutine xerbla (SRNAME, INFO)
XERBLA subroutine xerbla_array (SRNAME_ARRAY, SRNAME_LEN, INFO)
XERBLA_ARRAY

Detailed Description

This is the group of Auxiliary 3 BLAS routines.

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 SX

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2017

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 SX

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2017

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.

Date:

November 2017

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 SX

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2017

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(*)

logical function lsame (character CA, character CB)

LSAME

Purpose:

 LSAME returns .TRUE. if CA is the same letter as CB regardless of
 case.

Parameters:

CA

          CA is CHARACTER*1

CB

          CB is CHARACTER*1
          CA and CB specify the single characters to be compared.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

subroutine xerbla (character*(*) SRNAME, integer INFO)

XERBLA

Purpose:

 XERBLA  is an error handler for the LAPACK routines.
 It is called by an LAPACK routine if an input parameter has an
 invalid value.  A message is printed and execution stops.
 Installers may consider modifying the STOP statement in order to
 call system-specific exception-handling facilities.

Parameters:

SRNAME

          SRNAME is CHARACTER*(*)
          The name of the routine which called XERBLA.

INFO

          INFO is INTEGER
          The position of the invalid parameter in the parameter list
          of the calling routine.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

subroutine xerbla_array (character(1), dimension(srname_len) SRNAME_ARRAY, integer SRNAME_LEN, integer INFO)

XERBLA_ARRAY

Purpose:

 XERBLA_ARRAY assists other languages in calling XERBLA, the LAPACK
 and BLAS error handler.  Rather than taking a Fortran string argument
 as the function's name, XERBLA_ARRAY takes an array of single
 characters along with the array's length.  XERBLA_ARRAY then copies
 up to 32 characters of that array into a Fortran string and passes
 that to XERBLA.  If called with a non-positive SRNAME_LEN,
 XERBLA_ARRAY will call XERBLA with a string of all blank characters.
 Say some macro or other device makes XERBLA_ARRAY available to C99
 by a name lapack_xerbla and with a common Fortran calling convention.
 Then a C99 program could invoke XERBLA via:
    {
      int flen = strlen(__func__);
      lapack_xerbla(__func__, &flen, &info);
    }
 Providing XERBLA_ARRAY is not necessary for intercepting LAPACK
 errors.  XERBLA_ARRAY calls XERBLA.

Parameters:

SRNAME_ARRAY

          SRNAME_ARRAY is CHARACTER(1) array, dimension (SRNAME_LEN)
          The name of the routine which called XERBLA_ARRAY.

SRNAME_LEN

          SRNAME_LEN is INTEGER
          The length of the name in SRNAME_ARRAY.

INFO

          INFO is INTEGER
          The position of the invalid parameter in the parameter list
          of the calling routine.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

Author

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