algebraic expression ; substitution and simplificationRésolu

Question

Hello
I need code VB6 to do work in algebraic expressions until 3 variables.
The user writes in the text box the following function f(x1,x2):
5x1^3 + (x1^2+x2^2)^2 + 3*x1*x2^2 - 2*x1*x2  and a guess: x1=1 and x2=2 (example).
I need to show the expressions of the partial derivatives and to compute their value in this guess.
I need code to get the expression simplified as  a  monovariable function of  "t"   after the substituion (example) x1=1+4t  and x2=2-3t.
After that I can go on with the computations (method Frank-Wolfe) to optimize nonlinear functions in convex spaces.
Of course I'm ready to pay the code.
Best regards
Morais Silva
www.moraissilva.com
antoniocmsilva@netcabo.pt

moraissilva · Accepted Answer

I fogot to say that I only need code to manipulate the expressions. 
I already developed the code to the method Frank-Wolfe but it is necessary the user to write the function, the partial derivatives and the function linearized...
Morais Silva

cs_loulou69 · Answer

Hello, you can do that to get the result:
Formula= "5x1^3 + (x1^2+x2^2)^2 + 3*x1*x2^2 - 2*x1*x2"
Formula= Replace(Formula,x1,"1")
Formula= Replace(Formula,x2,"2")
Result= Eval(Formula)

moraissilva · Answer

I need the computation bau in the partial derivatives...


Anyway thank you.


Best regards


Morais Silva

Algebraic expression ; substitution and simplification

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