You can run AMPL on a
model and data file from the AMPL book by selecting one of each:
You may encounter problems because each browser is different, and some are broken.
Perhaps not surprisingly, later versions sometimes seem worse
than earlier versions, though things are getting better.
Here's our current experience with this sorry mess:
- Netscape 3.0 seems to work.
- Netscape 4.04 and later seem to work, though
scroll menu selections don't always toggle under Windows 95.
- Microsoft Internet Explorer 3.02 seems to work. It starts with a selection in each window
and no Browse button; file upload is not available.
- Microsoft Internet Explorer 4 and 5 appear to work.
Since IE4 and IE5 do not always automatically refresh forms when
you return to a previous page, they ares sometimes a pain to use.
- Mozilla 5.0 (M17) seems to work, except that the Back button
- Opera 3.21 doesn't handle tables well, so the
initial display may be confusing, with rows and columns apparently
There are no outlines around the scrolling menus.
When the size is reduced to 50%, scrolling menus and file-browse input areas
File upload doesn't work anyway.
- Opera 4.02 and Opera 5.12 do not work at all; models and data simply do not
appear in text areas, and the layout is wrong.
- Fonts, sizes, and colors are capricious and uncontrollable in all.
This is an experimental service
and we have disabled commands that affect security.
Other than that, all the features of AMPL are available.
Bear in mind that each time you push Send,
it is a fresh run of AMPL and the solver; there is
no memory from one run to the next except what is included
in the "model and data" window.
The solvers are provided through the courtesy of their
respective authors and owners, to whom we are deeply grateful.
For more information on these and other AMPL solvers, check
AMPL solvers page.
is a linear interior-point code by Csaba Mészáros; available from
a nonlinear solver by Peter Spellucci, is available from
is a nonlinear solver by Andy Conn, Nick Gould and Philippe Toint.
is an interior-point solver by
There are more AMPL
nonlinear optimization examples
on this page.
Lpsolve, a simplex code for LPs and MIPs by Michel Berkelaar,
is based on
available from the net.
is a linear and nonlinear solver by Bruce Murtagh and Michael Saunders;
it is the default.
PATH is a complementarity solver by
Steven Dirkse, and Todd Munson.
Some example complementarity problems appear
SNOPT is a nonlinear solver by
Philip Gill, Walter Murray, and Michael Saunders.
TN (by Stephen G. Nash)
and LBFGSB (by Ciyou Zhu
and Jorge Nocedal)
are truncated Newton algorithms for
bound-constrained problems -- problems whose only constraints are bounds on the
We record your IP address and your interactions with this system,
including any models and data that you provide,
solely for the purpose of better understanding how to improve
the service. We do not distribute this information to anyone else.
We'd like to hear from you if you have any problems or
suggestions on how to make the interface more useful. Mail to
Sat Jun 25 06:15:08 CDT 2005