sinc.m

来自「JAVA 数学程序库 提供常规的数值计算程序包」· M 代码 · 共 62 行

## Copyright (C) 1996, 1997 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, write to the Free
## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {} sinc (@var{x})
## Return
## @iftex
## @tex
## $ \sin (\pi x)/(\pi x)$.
## @end tex
## @end iftex
## @ifinfo
##  sin(pi*x)/(pi*x).
## @end ifinfo
## @end deftypefn

## Author: jwe ???

function result = sinc (x)

  result = ones (size (x));

  ii = (x != 0);

  if (any (ii(:)))
    t = pi * x(ii);
    result(ii) = sin (t) ./ t;
  endif

endfunction

/*
@GROUP
signal
@SYNTAX
sinc()
@DOC
.
@EXAMPLES
.
@NOTES
.
@SEE

*/