Re: Maximize

*To*: mathgroup at smc.vnet.net*Subject*: [mg91490] Re: Maximize*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Sat, 23 Aug 2008 01:44:03 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <g8lpbu$ikc$1@smc.vnet.net>

Gregory Lypny wrote: > Not sure why this won't work. I'm trying to maximize with respect to > x subject to a constraint. I get an error message saying that the > constraint is not a valid variable. > > Maximize[ > g + (1-g)*x -(g/2)*x^2 - (g/2)*v, > x = (a/c) + sqrt((d/c)*(v - 1/c)), > x > ] The expression is missing the pair of curly braces that must enclose the function and its constraint(s) *AND* you surely do not want to put an assignment (single equal sign "=") to x as a constraint :) So, syntacticly, the following expression makes sense: Maximize[{g + (1 - g)*x - (g/2)*x^2 - (g/2)*v, x == (a/c) + sqrt ((d/c)*(v - 1/c))}, x] Best regards, -- Jean-Marc