Backpropagation learning:

  bp_innerloop		The backpropagation learning algorithm, used
			in each of the demos below.

XOR Demo:
  bpxor.m		Learning the XOR function.
  XorPats.m		Input patterns for XOR.
  XorAns.m		Desired output patterns.
  PlotBpPats.m		Plot of input patterns
  PlotBpBoundary.m	Plot decision boundary during learning.

Encoder Demo:
  encoder.m		N-2-N encoder.
  PlotEncoder.m		Plot of encoder decision boudaries.

Function Approxmation Demo:
  approx.m		1-N-1 function approximator network.
  approxhelper.m        Inner loop of training algorithm.
  approxfn.m		Function to be approximated.
  PlotApprox.m          Plot hidden unit and approximator results.
