dpurelin (Neural Network Toolbox)

Linear transfer derivative function

dA_dN = dpurelin(N,A)

dpurelin is the derivative function for logsig.

dpurelin(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 purelin neurons.

N = [0.1; 0.8; -0.7];

We calculate the layer's output A with purelin and then the derivative of A with respect to N.

A = purelin(N)
dA_dN = dpurelin(N,A)

The derivative of purelin is calculated as follows:

D(i,q) = 1