Hyperbolic tangent sigmoid transfer derivative function
Syntax
dA_dN = dtansig(N,A)
Description
dtansig is the derivative function for tansig.
dtansig(N,A) takes two arguments,
N - S x Q net input.
A - S x Q output.
and returns the S x Q derivative dA/dN.
Examples
Here we define the net input N for a layer of 3 tansig neurons.
N = [0.1; 0.8; -0.7];
We calculate the layer's output A with tansig and then the derivative of A with respect to N.
A = tansig(N)
dA_dN = dtansig(N,A)
Algorithm
The derivative of tansig is calculated as follows:
d = 1-a^2
See Also
tansig, logsig, dlogsig
[ Previous | Help Desk | Next ]