Neural Network Toolbox

dpurelin

Linear transfer derivative function

Syntax

dA_dN = dpurelin(N,A)

Description

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)
  

Algorithm

The derivative of purelin is calculated as follows:

• D(i,q) = 1

See Also

purelin

dposlin

dradbas

© 1994-2005 The MathWorks, Inc.