sum1(3) LAPACK sum1(3)

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


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.

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 

          N is INTEGER
          The number of elements in the vector CX.

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.

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 

          N is INTEGER
          The number of elements in the vector CX.

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.

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