function perf=nullpf(e,x,pp)
%NULLPF Null performance function.
%
%	Syntax
%
%	  perf = nullpf(e,x,pp)
%	  perf = nullpf(e,net,pp)
%	  info = nullpf(code)
%
%	Warning!!
%
%	  This function may be altered or removed in future
%	  releases of the Neural Network Toolbox. We recommend
%	  you do not write code which calls this function.

% Mark Beale, 11-31-97
% Copyright 1992-2000 The MathWorks, Inc.
% $Revision: 1.5 $

if nargin < 1, error('Not enough input arguments.'), end

% FUNCTION INFO
% =============

if isstr(e)
  switch e
    case 'deriv',
	  perf = 'dnullpf';
    case 'name',
	  perf = 'Null';
    case 'pnames',
	  perf = {};
    case 'pdefaults',
	  perf = [];
    otherwise,
	  error('Unrecognized code.')
  end
  return
end

% CALCULATION
% ===========

perf = NaN;
