VZ_LOG_(3MVEC) Vector Math Library Functions VZ_LOG_(3MVEC)

## NAME

vz_log_, vc_log_ - vector complex logarithm functions

## SYNOPSIS

cc [__flag__... ] __file__... **-lmvec **[ __library__... ]

**void vz_log_**(**int ***__n__, **double complex * restrict **__z__,

**int ***__stridez__, **double _complex * restrict **__w__, **int ***__stridew__);

**void vc_log_**(**int ***__n__, **float complex * restrict **__z__,

**int ***__stridez__, **float complex * restrict **__w__, **int ***__stridew__);

## DESCRIPTION

These functions evaluate the complex function**log**(__z__) for an entire vector

of values at once. The first parameter specifies the number of values to

compute. Subsequent parameters specify the argument and result vectors.

Each vector is described by a pointer to the first element and a stride,

which is the increment between successive elements.

Specifically,**vz_log_**(__n__, __z__, __sz__, __w__, __sw__) computes __w__[__i__ * *__sw__] = **log**(__z__[__i__ *

*__sz__]) for each __i__ = 0, 1, ..., *__n__ - 1. The **vc_log_() **function performs the

same computation for single precision data.

These functions are not guaranteed to deliver results that are identical

to the results of the clog(3M) functions given the same arguments.

## USAGE

The element count *__n__ must be greater than zero. The strides for the

argument and result arrays can be arbitrary integers, but the arrays

themselves must not be the same or overlap. A zero stride effectively

collapses an entire vector into a single element. A negative stride

causes a vector to be accessed in descending memory order, but note that

the corresponding pointer must still point to the first element of the

vector to be used; if the stride is negative, this will be the highest-

addressed element in memory. This convention differs from the Level 1

BLAS, in which array parameters always refer to the lowest-addressed

element in memory even when negative increments are used.

These functions assume that the default round-to-nearest rounding

direction mode is in effect. On x86, these functions also assume that the

default round-to-64-bit rounding precision mode is in effect. The result

of calling a vector function with a non-default rounding mode in effect

is undefined.

Unlike the c99 clog(3M) functions, the vector complex exponential

functions make no attempt to handle special cases and exceptions; they

simply use textbook formulas to compute a complex exponential in terms of

real elementary functions. As a result, these functions can raise

different exceptions and/or deliver different results from**clog()**.

## ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

+----------------------------+-----------------------------+

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

+----------------------------+-----------------------------+

|Interface Stability | Committed |

+----------------------------+-----------------------------+

|MT-Level | MT-Safe |

+----------------------------+-----------------------------+

## SEE ALSO

clog(3M), attributes(5)

SunOS 5.11 December 14, 2007 VZ_LOG_(3MVEC)

vz_log_, vc_log_ - vector complex logarithm functions

cc [

These functions evaluate the complex function

of values at once. The first parameter specifies the number of values to

compute. Subsequent parameters specify the argument and result vectors.

Each vector is described by a pointer to the first element and a stride,

which is the increment between successive elements.

Specifically,

*

same computation for single precision data.

These functions are not guaranteed to deliver results that are identical

to the results of the clog(3M) functions given the same arguments.

The element count *

argument and result arrays can be arbitrary integers, but the arrays

themselves must not be the same or overlap. A zero stride effectively

collapses an entire vector into a single element. A negative stride

causes a vector to be accessed in descending memory order, but note that

the corresponding pointer must still point to the first element of the

vector to be used; if the stride is negative, this will be the highest-

addressed element in memory. This convention differs from the Level 1

BLAS, in which array parameters always refer to the lowest-addressed

element in memory even when negative increments are used.

These functions assume that the default round-to-nearest rounding

direction mode is in effect. On x86, these functions also assume that the

default round-to-64-bit rounding precision mode is in effect. The result

of calling a vector function with a non-default rounding mode in effect

is undefined.

Unlike the c99 clog(3M) functions, the vector complex exponential

functions make no attempt to handle special cases and exceptions; they

simply use textbook formulas to compute a complex exponential in terms of

real elementary functions. As a result, these functions can raise

different exceptions and/or deliver different results from

See attributes(5) for descriptions of the following attributes:

+----------------------------+-----------------------------+

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

+----------------------------+-----------------------------+

|Interface Stability | Committed |

+----------------------------+-----------------------------+

|MT-Level | MT-Safe |

+----------------------------+-----------------------------+

clog(3M), attributes(5)

SunOS 5.11 December 14, 2007 VZ_LOG_(3MVEC)