Warning Message wrt NMinimize function

*To*: mathgroup at smc.vnet.net*Subject*: [mg69731] Warning Message wrt NMinimize function*From*: "John Adeosun" <jtadeosun at yahoo.com>*Date*: Thu, 21 Sep 2006 07:32:17 -0400 (EDT)*Organization*: Stevens Institute of Technology (stevens-tech.edu)

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.

**Follow-Ups**:**Re: Warning Message wrt NMinimize function***From:*"Chris Chiasson" <chris@chiasson.name>