Problem building a custom transfer function for feedforward neural network

Hello,

I am trying to build a custom transfer function for my feedforward neural network in Matlab R2019a. But, I face attached error. I defined my new sigmoid function as 'mytanhfunction' as following and I save it in my working directory. Then I try to go to main directory which (matlab installation directory) and I added 'mytanhfunction' just like other functions (like tansig and purelin ...). Still it gives me the same error. I appreciate any help on this.

function a = mytanhfunction(n,varargin)

if nargin > 0

n = convertStringsToChars(n);

end

if ischar(n)

a = nnet7.transfer_fcn(mfilename,n,varargin{:});

return

end

% Apply

a = 1 ./ (exp(-26*(n - .3)) + 1);

I used following two forms of commands in order to design my network. Both gave me the same error I attached to this.

nsk1 = 3; % number of first hidden layer neuron

nsk2 = 2; % number of second hidden layer neuron

% X=inputs

% T= target

nsk1=2;

nsk2=2;

net = newff(X,T,[nsk1,nsk2],{'mytanhfunction','mytanhfunction','purelin'});

net.trainParam.epochs = 50;

net = train(net,X,T);

______________________________________________

net = fitnet;

net.layers{1}.transferFcn = 'mytanhfunction';

Answer 1

[Alireza Bagheri]

I appreciate a quick response!

Answer 2

[Alireza Bagheri]

I am still waiting for an asnswer!