lnn.m

来自「很多matlab的源代码」· M 代码 · 共 20 行

function Y = lnn(x)
% LNN 	Natural log with zero exception.
%	Y = LNN(X) returns the Natural log of X with LOG(0) = -175
%	THIS SUPPORT FILE is used by special mathematical functions.


% ADSP Toolbox: Version 2.0 
% For use with "Analog and Digital Signal Processing", 2nd Ed.
% Published by PWS Publishing Co.
%
% Ashok Ambardar, EE Dept. MTU, Houghton, MI 49931, USA
% http://www.ee.mtu/faculty/akambard.html
% e-mail: [e-mail]
% Copyright (c) 1998


if nargin==0,help lnn,return,end

Y = log(x+(x==0))-175*(x==0);