Hello guys,

I have some system of differential equations,

How can i find  eigenvalues of this system?

If i have solution

res := evalf(dsolve(sys union ics, convert(x, list), type = numeric, method = rkf45))

and

sol := evalf(dsolve(sys union ics, convert(x, list), method = laplace))

AnSolution.mw

Thanks!

Hello guys,i have some systems of diff eq,i tried to solve using dsolve but i have error.
system.pdf

system_solve.mw

Hello guys, i have some matrix equations.

A^(T)*X+X*A+Q = 0 , where A,Q - matrixs, X - unknown matrix, i need to solve this.

i tried to solve this from http://www.mapleprimes.com/questions/200940-How-To-Solve-Matrix-Equation-Problem-In-Maple#answer203570 methods, but not successfully.

How can to solve this problem?

multMatrix.mw

thx.

Hello guys, i have some problems.

i have system

s=b*u = 

now, we have X' = (A+S)X,  i need numeric/analytical solution and found Vector(X)

I have some problems with syntax maple.

Sorry for my bad english.

ricatti.mw

Hello guys.

I have a system of differential equations , which I want to solve the perturbation method , but the following problem :

I got zero approximation 

SYS0 := dsolve({Sys, isc}, {delta0(x), u0(x)}, type = numeric, output = listprocedure)

SYS0:=[x=proc(x) ... end proc,delta0(x)=proc(x) ... end proc,u0(x)=proc(x) ... end proc]

How can I use the zero-order approximation for the future is being computed ?

I tried to do so:

F := eval(delta0(x), SYS0);
F1 := eval(u0(x), SYS0);

Fdiff := eval(diff(delta0(x), x), SYS0);
F1diff := eval(diff(u0(x), x), SYS0);

Error, (in eval/diff) non-algebraic expressions cannot be differentiated

Sysq := ((9/10)*F1(x)*F(x)*F1diff-(3/10)*Fdiff*F1(x)*F1(x)+(3/2)*F1(x))*F(x) = (1/5)*F(x)*delta1(x)-(3/10)*u1(x);

Sysqq := u1(x)*Fdiff+F1(x)*(diff(delta1(x), x))+delta1(x)*F1diff+F(x)*(diff(u1(x), x)) = 0;

SystemSec := Sysq, Sysqq;

SYS22 := dsolve({SystemSec, delta1(0) = 10^(-8), u1(0) = 10^(-8)}, {delta1(x), u1(x)}, type = numeric);

but I can not differentiate u0 (x), delta0 (x) to find u1 (x), delta1 (x) in my system

123.mw

Sorry for my english

Thank