Neural Network Toolbox

dnetprod

Derivative of net input product function

Syntax

dN_dZ = dnetprod(Z,N)

Description

dnetprod is the net input derivative function for netprod.

dnetprod takes two arguments,

• Z -- S x Q weighted input

  N -- S x Q net input

and returns the S x Q derivative dN/dZ.

Examples

Here we define two weighted inputs for a layer with three neurons.

• Z1 = [0; 1; -1];
  Z2 = [1; 0.5; 1.2];
  

We calculate the layer's net input N with netprod and then the derivative of N with respect to each weighted input.

• N = netprod(Z1,Z2)
  dN_dZ1 = dnetprod(Z1,N)
  dN_dZ2 = dnetprod(Z2,N)
  

Algorithm

The derivative of a product with respect to any element of that product is the product of the other elements.

See Also

netsum, netprod, dnetsum

dmsereg

dnetsum

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