Hi all

I am trying to maximize a function f(x,y,z,w) in terms of x. (Only x is treated as a variable, and the others are treated as parameters).

However, all I know is that y,z,w they are parameters and they are non-negative. I have already tried with the "optmization help page" from maplesoft's website, and it looks like it will search the range of x,y,z,w, and it will return numerical values at which this function is maximized. 

However, what I want is instead a close-form solution of x=g(y,z,w) that will maximize the function.   In other words, I would like to keep the parameter in symbolic forms. 

Can Maple do that?

Hi all

I am having a very complicated equation that has the form of 

x*y^2/(x+1)+x*(1/(x-2y)^2)=0

Of course, the actual equation is more complicate than above. It is just an example. I want to solve the equation in terms of x. And I know that both x and y are real, and they are positive (greater than 0). My question is, how should I specify this when solving the equation?

PS: I try to run the program to the solve the equation (without specifying that they are real and positive), and at the output, it gave me something like:

"RootOf(y^2+2y+.......)".   What is that "RootOf" means? Square-root or what?

Hi all.

I want to know how do I declare symbol in maple. Say y=2x+b, I want maple to treat this y as a function of x with b as a constant (or symbol). How should I do that?

More specificaly, I am trying to ask maple to do some calculation for me. and it returns me "Fail". So I am suspecting that maple didn't take other letters as symbol. Here is my code:

with(Statistics); h := RandomVariable(Exponential(H)); simplify(PDF(h, t))

with(Statistics); g := RandomVariable(Exponential(G)); simplify(PDF(g, t))

constants := constants, Ps Pr

PDF(Ps*g*h/(Pr*g+2), t)

but maple return:

          Fail