prn2lb.f File Reference

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Functions/Subroutines
subroutine	prn2lb (n, x, f, g, iprint, itfile, iter, nfgv, nact, sbgnrm, nseg, word, iword, iback, stp, xstep)
	This subroutine prints out new information after a successful line search. More...

Function/Subroutine Documentation

prn2lb()

subroutine prn2lb	(	integer	n,
		double precision, dimension(n)	x,
		double precision	f,
		double precision, dimension(n)	g,
		integer	iprint,
		integer	itfile,
		integer	iter,
		integer	nfgv,
		integer	nact,
		double precision	sbgnrm,
		integer	nseg,
		character*3	word,
		integer	iword,
		integer	iback,
		double precision	stp,
		double precision	xstep
	)

This subroutine prints out new information after a successful line search.

Parameters

n	On entry n is the number of variables. On exit n is unchanged.
x	On entry x is an approximation to the solution. On exit x is the current approximation.
f	On first entry f is unspecified. On final exit f is the value of the function at x.
g	On first entry g is unspecified. On final exit g is the value of the gradient at x.
iprint	It controls the frequency and type of output generated: iprint<0 no output is generated; iprint=0 print only one line at the last iteration; 0<iprint<99 print also f and |proj g| every iprint iterations; iprint=99 print details of every iteration except n-vectors; iprint=100 print also the changes of active set and final x; iprint>100 print details of every iteration including x and g; When iprint > 0, the file iterate.dat will be created to summarize the iteration.
itfile	unit number of iterate.dat file
iter	Current outer iteration number; printed on the per-iterate summary line.
nfgv	Cumulative number of f/g evaluations across the whole run; logged into the iterate.dat record.
nact	Number of variables active at their bounds at the current iterate.
sbgnrm	Infinity norm of the projected gradient at x; the natural first-order optimality measure printed alongside f.
nseg	Number of breakpoint segments traversed by cauchy at the current iteration; printed for diagnostic accounting.
word	On exit a 3-character status code summarising the subspace solution: 'con' (converged), 'bnd' (hit a bound), 'TNT' (truncated-Newton step used), or '—' otherwise. Determined from iword.
iword	Status code from subsm: 0 = subspace minimisation converged, 1 = stopped at a bound, 5 = truncated-Newton step used. Maps to word.
iback	Number of backtracks the line search performed.
stp	Final step length accepted by the line search.
xstep	stp * ||d|| – the actual length of the step in x-space.

Definition at line 53 of file prn2lb.f.

Referenced by mainlb().

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