dtansigtf_snn.m

来自「神经网络的工具箱, 神经网络的工具箱,」· M 代码 · 共 31 行

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

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

df_dx = 1 - (f0.*f0);