NAME

sum1 - sum1: sum | x_i | (in LAPACK)

SYNOPSIS

Functions

double precision function dzsum1 (n, cx, incx)
DZSUM1 forms the 1-norm of the complex vector using the true absolute value. real function scsum1 (n, cx, incx)
SCSUM1 forms the 1-norm of the complex vector using the true absolute value.

Detailed Description

Function Documentation

double precision function dzsum1 (integer n, complex16, dimension( ) cx, integer incx)

DZSUM1 forms the 1-norm of the complex vector using the true absolute value.

Purpose:



 DZSUM1 takes the sum of the absolute values of a complex


 vector and returns a double precision result.


 Based on DZASUM from the Level 1 BLAS.


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

Parameters



          N is INTEGER


          The number of elements in the vector CX.



          CX is COMPLEX*16 array, dimension (N)


          The vector whose elements will be summed.

INCX



          INCX is INTEGER


          The spacing between successive values of CX.  INCX > 0.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Contributors:

Nick Higham for use with ZLACON.

Definition at line 80 of file dzsum1.f.

real function scsum1 (integer n, complex, dimension( * ) cx, integer incx)

SCSUM1 forms the 1-norm of the complex vector using the true absolute value.

Purpose:



 SCSUM1 takes the sum of the absolute values of a complex


 vector and returns a single precision result.


 Based on SCASUM from the Level 1 BLAS.


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

Parameters



          N is INTEGER


          The number of elements in the vector CX.



          CX is COMPLEX array, dimension (N)


          The vector whose elements will be summed.

INCX



          INCX is INTEGER


          The spacing between successive values of CX.  INCX > 0.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Contributors:

Nick Higham for use with CLACON.

Definition at line 80 of file scsum1.f.

Author

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