Re: Warning Message wrt NMinimize function

*To*: mathgroup at smc.vnet.net*Subject*: [mg69758] Re: Warning Message wrt NMinimize function*From*: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>*Date*: Fri, 22 Sep 2006 01:04:31 -0400 (EDT)*Organization*: Uni Leipzig*References*: <eeu01h$b83$1@smc.vnet.net>

Hi, regardless of the fact that your input is nonsense, because your objective function does not depend on y at all With[{n = 4}, aa = Table[Random[], {n}]; bb = Table[Random[], {n}]; NMinimize[{Plus @@ Table[(aa[[i]] - bb[[i]])^2, {i, n}], {y > 0}}, y, Method -> "DifferentialEvolution"] ] work fine for me and I assume, that you hide some facts to prevent us from answer your question. Regards Jens "John Adeosun" <jtadeosun at yahoo.com> schrieb im Newsbeitrag news:eeu01h$b83$1 at smc.vnet.net... | Hello Everyone, | | I want to use NMinimize to solve an optimization problem. In essence, I'm | trying to numerically minimize the "sum of a square of errors" for two | lists, aa and bb (earlier generated lists of n elements or points), using | the below syntax: | | NMinimize[{Plus @@ Table[(aa[[i]] - bb[[i]])^2, {i, n}], {y> 0}}, y, | Method -> "DifferentialEvolution"] | This does not yield the intended result of, say, {minimumvalue, y->10.012}. | I have been getting an expression (unevaluated "result" ) with a warning | message such as: | | NMinimize::nnum : The function value {336.381} is not a number at {y}= | {0.063703}. More... | | I then clicked on 'More' for help. I got the below message from the help | browser: | | "General::nnum | | function::nnum: The function value `3` is not a number at `2` = `1`. | | Notes for this message have not yet been added." | | Has anyone experienced this before? Is anything wrong with my syntax above? | | Thanks in advance for your useful insight. | | John. | | | | | |