Recent content by Nesrine

Thank you very much for your help...but the problem is that since I'm not used to Mathematica I don't understand so functions that you have used. For example I supposed in this part you defined the Matrix A (*A=2.id-RotateRight[id,1]-RotateRight[id,-1];*) A = SparseArray[{Band[{1, 1}] -> 2...

hello , I need to solve a differential system with mathematica that has the form : B'=A*B knowing that B and A are (12,12) Matrix and with initial conditions B(0)=I Can you help me please Thanks

I heard that a fourth order Runge Kutta integration procedure with Gill coefficients is the solution to my problem...the thing is that I don't know how to program this on mathématica Can you help me please ?? Thanks

hi , I need to create a program on mathématica 8 to study the stability of my system using Floquet transition matrix . to compute the Floquet transition matrix I made this program based on a fourth order Runge Kutta integration : X1[t_] = {x1[t], x2[t], x3[t], x4[t], x5[t], x6[t] ...

Hello , I have tried to solve a system of differentiel equations with mathematica that is presented as follow X[t_] = {x1[t], x2[t], x3[t], x4[t], x5[t], x6[t] , x7[t], x8[t], x9[t], x10[t], x11[t], x12[t]}; system = MapThread[#1 == #2 &, {X'[t], A.X[t]}]; where the matrix A is...

Thank you very much Bill I'll try with the reference you gave it to me I'll keep you posted :))

Thanks for your answer I used NDSolve actually and I'm trying to simulate my program with it but I know that I can use Runge Kutta to resolve such problem the thing is that I don't know if there is in mathematica a function that allow me to do a 4th order runge kutta integration

I need to solve a differential system with mathematica that is presented like this : eqns = { X1'[t] == A[[1]][[1]] X1[t] + A[[1]][[2]] X2[t] + A[[1]][[3]] X3[t] + A[[1]][[4]] X4[t] + A[[1]][[5]] X5[t] + A[[1]][[6]] X6[t], X2'[t] == A[[2]][[1]] X1[t] + A[[2]][[2]]...