The OpenNET Project / Index page

[ новости /+++ | форум | wiki | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

vcospi_ (3)
  • >> vcospi_ (3) ( Solaris man: Библиотечные вызовы )
  •  

    NAME

    vcospi_, vcospif_ - vector cospi functions
     
    

    SYNOPSIS

    cc [ flag... ] file... -lmvec [ library... ]
    
    void vcospi_(int *n, double * restrict x, int *stridex,
        double * restrict y, int *stridey);
    

    void vcosfpi_(int *n, float * restrict x, int *stridex,
        float * restrict y, int *stridey);
    

     

    DESCRIPTION

    These functions evaluate the function cospi(x), defined by cospi(x) = cos(pi
     * x), 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, vcospi_(n, x, sx, y, sy) computes y[i * *sy] = cospi(x[i * *sx]) for each i = 0, 1, ..., *n - 1. The vcospif_() function performs the same computation for single precision data.

    Non-exceptional results are accurate to within a unit in the last place.  

    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.

    These functions handle special cases and exceptions in the spirit of IEEE 754. In particular,

    o cospi(NaN) is NaN,
    o cospi(±Inf) is NaN, and an invalid operation exception is raised.

    An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. The application can then examine the result or argument vectors for exceptional values. Some vector functions can raise the inexact exception even if all elements of the argument array are such that the numerical results are exact.  

    ATTRIBUTES

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

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityCommitted

    MT-Level

     

    SEE ALSO

    feclearexcept(3M), fetestexcept(3M), attributes(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    USAGE
    ATTRIBUTES
    SEE ALSO


    Поиск по тексту MAN-ов: 




    Партнёры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2024 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру