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Date:     Mon, 23 Mar 87  15:38:04 MST
From: TAYLOR%CSUGREEN.BITNET@wiscvm.wisc.edu
          (G. D. TAYLOR, MATH, COLORADO STATE UNIV.)
Subject:  DIFFERENTIAL CORRECTION
To: dongarra%dasher@anl-mcs.arpa
In-Reply-To: Re: differential correction algorithm <8702190444.AA22025@dasher.su
Status: RO


Jack, here are a description of dicor for the index and a short paragraph.
For the index:
              This package uses the differential correction algorithm to
compute a best uniform generalized rational approximation P/Q to a function
F defined on a finite set of grid points, with the options of including a
weight function and constraints on P/Q and Q.

For the paragraph:
                  This package uses the differential correction algorithm
to compute a best uniform generalized rational approximation P/Q to a
function F defined on a finite set of grid points, with the options of
including a weight function and constaints on P/Q and Q.  The program is
run by calling subroutine SDFCOR, which calls all the other subroutines
(except for subroutine STCOMP, which can be called directly from the
driver program (if desired) to compute the coordinates of the grid points
in a one-dimensional or rectangular two-dimensional pattern.  For detailed
information on the parameters, features and operation of this package, see
the prologues in subroutines SDFCOR (lines 3-359) and STCOMP (lines 3-56).
For the setting of machine dependent parameters, see subprograms I1MACH
and R1MACH.

Jack, if the driver will be sent with this code then add the following
sentence to the above paragraph:
                                The DRIVER included with this code can be
used to assist implementation of this code as the output corresponding to
it will tell if the code ran as expected.

Regards, Jerry.


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