Re: Re: NMaximize Questions
- To: mathgroup at smc.vnet.net
- Subject: [mg90972] Re: [mg90954] Re: NMaximize Questions
- From: "Stuart Nettleton" <stuart.nettleton at optusnet.com.au>
- Date: Fri, 1 Aug 2008 03:00:24 -0400 (EDT)
- References: <email@example.com> <200807311003.GAA11370@smc.vnet.net>
Jean-Marc, Many thanks for your clarification of the NMaximize error message, which I had found quite cryptic! I am wondering if NMaximize can be made faster for a large system of equations by doing some directed acyclic graph (DAC) / topological sorting to find the "leaves" or independent variables first. I am wondering whether, instead of submitting a large system of equations and variables, it might be faster to only submit the leaves as variables and use a function to topologically process the objective function. I have looked at Reduce, but it seems to take as long or longer than NMaximize. Also, NMaximize already seems to use a function like FindInstance to locate "true" in the identities. I would be interested in your opinion on whether DAC preprocessing is likely to be of any value or if NMaximize internally uses equivalent techniques anyway? Many Thanks, Stuart -- UTS CRICOS Provider Code: 00099F DISCLAIMER: This email message and any accompanying attachments may contain confidential information. If you are not the intended recipient, do not read, use, disseminate, distribute or copy this message or attachments. If you have received this message in error, please notify the sender immediately and delete this message. Any views expressed in this message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views the University of Technology, Sydney. Before opening any attachments, please check them for viruses and defects.