dlogsigtf_snn.m

神经网络的工具箱, 神经网络的工具箱,

function df_dx = dlogsigtf_snn(x0,f0)
%DLOGSIGTF_SNN Log sigmoid transfer derivative function.
%
%  Syntax
%
%   df_dx = dlogsigtf_snn(x0,f0)
%   df_dx = dlogsigtf_snn(x0)
%
%  Description
%
%   DLOGSIGTF_SNN is the derivative function for LOGSIGTF_SNN(x).
%
%   DLOGSIGTF_SNN(x0,f0) takes two arguments,
%     x0 - input of LOGSIGTF_SNN.
%     f0 - output of LOGSIGTF_SNN (optional).
%   and returns 
%     df_dx the derivative of LOGSIGTF_SNN(x) in x0. 
%
%  See also 
%
%   LOGSIGTF_SNN.
%

if (nargin == 1)
   f0 = logsigtf_snn(x0);
end

df_dx = f0 .* (1 - f0);