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:**

December 2016

**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:**

December 2016

**Further Details:**

## 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:**

December 2016

**Further Details:**

## 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:**

December 2016

**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

Definition at line 55 of file lsame.f.
## 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

Definition at line 62 of file BLAS/SRC/xerbla.f.
## 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

Definition at line 82 of file BLAS/SRC/xerbla_array.f.
# Author

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