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lbfgs.c  view on Meta::CPAN

	width = param->max_step - param->min_step;
	prev_width = 2.0 * width;

	/* Copy the value of x to the work area. */
	veccpy(wa, x, n);

	/*
		The variables stx, fx, dgx contain the values of the step,
		function, and directional derivative at the best step.
		The variables sty, fy, dgy contain the value of the step,
		function, and derivative at the other endpoint of
		the interval of uncertainty.
		The variables stp, f, dg contain the values of the step,
		function, and derivative at the current step.
	*/
	stx = sty = 0.;
	fx = fy = finit;
	dgx = dgy = dginit;

	for (;;) {
		/*

lbfgs.c  view on Meta::CPAN

	a = (u) - (v); \
	(qm) = (v) + (dv) / ((dv) - (du)) * a;

/**
 * Update a safeguarded trial value and interval for line search.
 *
 *	The parameter x represents the step with the least function value.
 *	The parameter t represents the current step. This function assumes
 *	that the derivative at the point of x in the direction of the step.
 *	If the bracket is set to true, the minimizer has been bracketed in
 *	an interval of uncertainty with endpoints between x and y.
 *
 *	@param	x		The pointer to the value of one endpoint.
 *	@param	fx		The pointer to the value of f(x).
 *	@param	dx		The pointer to the value of f'(x).
 *	@param	y		The pointer to the value of another endpoint.
 *	@param	fy		The pointer to the value of f(y).
 *	@param	dy		The pointer to the value of f'(y).
 *	@param	t		The pointer to the value of the trial value, t.
 *	@param	ft		The pointer to the value of f(t).
 *	@param	dt		The pointer to the value of f'(t).
 *	@param	tmin	The minimum value for the trial value, t.
 *	@param	tmax	The maximum value for the trial value, t.
 *	@param	brackt	The pointer to the predicate if the trial value is
 *					bracketed.
 *	@retval	int		Status value. Zero indicates a normal termination.