C-WHIZ C-WHIZC-WHIZ is the general purpose linear simplex optimizer for Ketron's
mathematical programming system, MPSIII.
It is also known as WHIZARD
lp. There is a stand-alone version, a callable library version, OML,
and a version that is integrated into the model management system, DATAFORM.
Linear programming. The linear programming algorithms are:
primal simplex, dual simplex, and network simplex. Matrix supersparsity is
uniquely exploited to minimize memory consumption; this lets you solve a larger
problem in a smaller machine. An automatic presolve process reduces a model to
its essential core. C-WHIZ chooses between two factorization algorithms,
P
C-WHIZ Presolve. Large, automatically generated models often
contain structures that would not be there if you could carefully screen them
out. C-WHIZ does that screening for you and usually reduces the model size
dramatically with an even greater reduction in solution time. The presolve looks
for redundancies, degeneracies, singleton rows, singleton columns, transfer
columns, duplicate rows, non-constraining rows, infeasibilities, ... Of equal
importance is the C-WHIZ Postsolve that restores all of this structure and
extends the optimal basis.
Input, Output. C-WHIZ accepts standard MPS format and
equation form input. A more efficient MPSIII proprietary format is available. A
wide variety of outputs (Solution, Ranging, ...) are produced in formats to meet
your needs: text, binary, and proprietary formats.
Platforms. C-WHIZ runs on Pentium and compatible PC's, many
workstations, and IBM mainframes. The C-coded C-WHIZ runs on all of these
platforms; the original mainframe WHIZARD is written in assembly language for
even greater efficiency.
On the PC, a Windows GUI provides a familiar front-end to the optimizers, it is
particularly useful when you are exploring the solution controls for a new or
troublesome model. The GUI gives you access to several utilities including a
powerful matrix editor, MATEDIT, for viewing and even modifying your
matrix and an interactive solution viewer, SOLVIEW.
Need more info? Contact:
Ketron Management Science
Ketron Division of The Bionetics
Corporation
2001 Jefferson Davis Hwy, #1211
Arlington, VA 22202-3619
USA
Phone: 703 412 3201 Fax: 703 412 9407
email: info@ketronms.com
Reference:
User's Reference Manual for C-WHIZ, Ketron Management Science, August
2000
Manual is downloadable from www.ketronms.com .
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