Basic plotting of an evaluated function

*To*: mathgroup at smc.vnet.net*Subject*: [mg86881] Basic plotting of an evaluated function*From*: "lederer at ssb.rochester.edu" <lederer at ssb.rochester.edu>*Date*: Tue, 25 Mar 2008 01:15:15 -0500 (EST)

I am trying to do something basic--but I cannot figure it out I have some function in two varaibles f[x_,y_]= some arbitrary polynomial Now I want to minimize the function with respect to y over some compact interval with fixed x NMinimize[{f[x,y],y=995,y=989},y] I want to plot the y's versus the x's. I have tried many things like defining s[x_]=Part[NMinimize[{f[x,y],y=995,y=989},y],2] Plot[s[x],{x,-14, 46}] or variations Plot[tt/.s[x],{x,-14, 46}]. Many error messages or nothing at all results......... I am sure this is easy, and someone can suggest how to do this. However, one more thing would be greatly helpful (give a man a decent and readable Mathematica manual and he can feed himself...) I am baffled by what Mathematica wants when it comes to using a single part of a list and changing it to a scalar. Suppose as above q is a vector with a rule assigning a value to some variable x that is x- >some number, and this assignment is in the third position of the list What is going on with q/.d[[3]] for example: Is q now a scalar? If not why not? Thanks for you help, Phil Lederer