Try AMPL!

You can run AMPL on a model and data file from the AMPL book by selecting one of each:

Book order:	Alphabetical:

Or upload your own model and data files, if your browser supports it:
Model:
Data:
Or you can type or paste in models and data; push Submit without making a selection.

Now push or push to undo any changes you made.

Broken Browsers:

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 doesn't respond.
Opera 3.21 doesn't handle tables well, so the initial display may be confusing, with rows and columns apparently interchanged. There are no outlines around the scrolling menus. When the size is reduced to 50%, scrolling menus and file-browse input areas overlap. 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.

Fine print:

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. Solvers include:

BPMPD is a linear interior-point code by Csaba Mészáros; available from netlib.
DONLP2, a nonlinear solver by Peter Spellucci, is available from netlib.
Lancelot is a nonlinear solver by Andy Conn, Nick Gould and Philippe Toint.
LOQO is an interior-point solver by Robert Vanderbei. There are more AMPL nonlinear optimization examples on this page.
Lpsolve, a simplex code for LPs and MIPs by Michel Berkelaar, is based on lp_solve, available from the net.
MINOS is a linear and nonlinear solver by Bruce Murtagh and Michael Saunders; it is the default.
PATH is a complementarity solver by Michael Ferris, Steven Dirkse, and Todd Munson. Some example complementarity problems appear here.
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 variables.

For more information on these and other AMPL solvers, check the AMPL solvers page.

Privacy policy:

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 info@ampl.com

Sat Jun 25 06:15:08 CDT 2005