VBA - Solver use on arrays

[Lucy Pearl]

I have developed an excel sheet which can calculate a certain number of data
via the solver-macro. Now I need to improve my sheet by only running all
calculations and data in the "background", i.e. show no data in any sheets,
unless it is the final result.

Basically, the problem is to get the FXW out of the following:
Minimize FunctionX
s.t.
1) (Min)imum < (W)eighting of variable
2) (W)eighting of variable < (Max)imum
3) (Sum) of FXW = 1
4) Max Weight of varible 1 to y (W_1y) = Predefined by Cell reference (MaxY)
5) Max Weight of varible y+1 to n (W_yn) = Predefined by Cell reference (MaxN)

Min and Max are arrays defined in functions. 4 and 5 is summation of
variable weight in the FXW, see below.
FunctionX is given as an FXW * matrix * FXW^-1, where FXW will be the weight
of each variable.

Input:
a) Max
b) Min
c) MaxY
d) MaxN
e) Matrix
Arrays and Matrix is n

Code is like this (in generel terms):
Function MaxY()
MaxY = Sheets("Inputs").Cells(5, 31).Value
End Function

Function W_1y()
Dim i as integer
for i=1 to y
x = x + FXW(1,i)
next i
W_1y = x
End Function

Function MinFunctionX()
ReDim FXW(n)
FunctionX = FXW * matrix * FXW^-1
SolverReset
Call solveradd(Sum, 2, "1")
Call solveradd(FXW, 3, Min)
Call solveradd(FXW, 1, Max)
Call solveradd(W_1y, 1, MaxY)
Call solveradd(W_yn, 1, MaxN)
Call solverok(FunctionX, 2, 0, FXW)
Call SolverSolve(True)
SolverFinish
MinFunctionX = FXW
End Function

What I don't know is 1) if I can use functions in the call solver... 2) the
repeated calculation of W_1y and W_yn is done in another function, is this
appropriate, even possible? 3) how to store the FXW for other use. I would
like to be able to double check the values with the slow excel program i got.