wolffd@0: function y = linef(lambda, fn, x, d, varargin)
wolffd@0: %LINEF	Calculate function value along a line.
wolffd@0: %
wolffd@0: %	Description
wolffd@0: %	LINEF(LAMBDA, FN, X, D) calculates the value of the function FN at
wolffd@0: %	the point X+LAMBDA*D.  Here X is a row vector and LAMBDA is a scalar.
wolffd@0: %
wolffd@0: %	LINEF(LAMBDA, FN, X, D, P1, P2, ...) allows additional arguments to
wolffd@0: %	be passed to FN().   This function is used for convenience in some of
wolffd@0: %	the optimisation routines.
wolffd@0: %
wolffd@0: %	See also
wolffd@0: %	GRADCHEK, LINEMIN
wolffd@0: %
wolffd@0: 
wolffd@0: %	Copyright (c) Ian T Nabney (1996-2001)
wolffd@0: 
wolffd@0: % Check function string
wolffd@0: fn = fcnchk(fn, length(varargin));
wolffd@0: 
wolffd@0: y = feval(fn, x+lambda.*d, varargin{:});