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