asum(3) Library Functions Manual asum(3)

# NAME

asum - asum: sum | real( x_i ) | + | imag( x_i ) |

# SYNOPSIS

## Functions

double precision function dasum (n, dx, incx)
DASUM double precision function dzasum (n, zx, incx)
DZASUM real function sasum (n, sx, incx)
SASUM real function scasum (n, cx, incx)
SCASUM

# Function Documentation

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

DASUM

Purpose:

`    DASUM takes the sum of the absolute values.`

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

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(*)```

Definition at line 70 of file dasum.f.

## double precision function dzasum (integer n, complex*16, dimension(*) zx, integer incx)

DZASUM

Purpose:

```    DZASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
returns a double precision result.```

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

NAG Ltd.

Further Details:

```     jack dongarra, 3/11/78.
modified 3/93 to return if incx .le. 0.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 71 of file dzasum.f.

## real function sasum (integer n, real, dimension(*) sx, integer incx)

SASUM

Purpose:

```    SASUM takes the sum of the absolute values.
uses unrolled loops for increment equal to one.```

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

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(*)```

Definition at line 71 of file sasum.f.

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

SCASUM

Purpose:

```    SCASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
returns a single precision result.```

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

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(*)```

Definition at line 71 of file scasum.f.

# Author

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