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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 string
fn = fcnchk(fn, length(varargin));
y = feval(fn, x+lambda.*d, varargin{:});
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