nmani

Hi,

Assume I have an eqn:=diff(x(t),t)+diff(y(t),t,t)+x(t)=0(It is just an example) for example, how can I find in which order variables are apearing here in this eqns?

for example I can give this eqn and result for x would be 1 and for y would be 2.

What is Maple command for that?

Thanks in advance,

Bye

Hi

I have a problem which works properly outside the proc but when it is inside the proc I see an error which says: illegal use of a formal parameter.

What should I do?

Here is that procedure:

Hello,

I am wrting my thesis which is on some MapleSim models. In Ref I introduce MapleSim, I wanna know if MapleSim has Document Object Identifier (DOI) number or name that I can refer to.

Thanks so much,

Bye

Hello,

I have a ode system which I use dsolve/numeric for it?

By default dsolve use rkf45 but the result is not very exact. The error is high.

How can I make dsolve more accurate?

Which method I have to use?

It is initial value problem that I use dsolve/numeric for it.

Thanks so much.

Bye

Hello all,

I have an ODE system called RedSys which is below and incons1 which is its initial condition.

When I want to solve this system by dsolve numeric with this command:

dsolve((convert(RedSys, set)union incons1), numeric, implicit = true);

I face an error which says :

system should be linear in leading derivative. However when check I do not see any non linearity.

could you please let me know what should I do to solve this system by dsolve/numeric?

Thanks so much,

I have a big list in Maple named A with 324 elements. I want to change one of the elements of that. For Example  I want to say

A[274]:=xi=xj;But I receive error which says:Error, assigning to a long list, please use Arrays.

Hello,

I have a system which is below:

X6-n4-n2, -n3+n1, -n4*X17t+n2*X9t, n3*X17t^2-n4*X17tt-n1*X9t^2+n2*X9tt, 130*X9tt-60*X17tt*n2*n4+60*X17tt*n1*n3-40*n2*X11+981*n2+60*n2*n3*X17t^2+60*n1*n4*X17t^2, -1500*X9tt*n2*n4+1500*X9tt*n1*n3+2250*X17tt+1000*n4*X11-14715*n4+1500*n4*X9t^2*n1+1500*n3*X9t^2*n2, n1^2+n2^2-1, n3^2+n4^2-1

I need to do primedecomposition for it. Maple could not do this for me kernel was lost. However system is not very big.

Hello,

I have a system of polynomials that I need to calculate its primedecomposition.

It has been trying for several hours but it could not give me result.

Even I tried to have Grobner basis and I could not.

Could you please let me know what should I do for that?

Hello,

How can I know which component is embedded in another one when I calculate PrimeDecomposition.

In this file which is attached I know <y> is embedded in <x,y> but how can I ask this from maple?

Which Maple command can helps me to know one component by PrimeDecomposition is embedded in another one.

File is attached here.

Bye,

Hello

I have a system of polynomial which I like to know its primedecomposition but it can not be done in maple even after one day.
They system is J in attahcned file here .

They system is not that much big why primedecomposition can not be calculated in maple even after one day.

How can I calculate its primedecomposition of this J in Maple in resonable amount of time?
What should I do? I need to know K1.

Thanks so much,

I have a DAE,ODE system which is not linear in all leading derivatives or leading dependent functions. This system is really big if I use explicit=true it goes for ever.

I need to know in what way I can use (dsolve/numeric, implicit=true) to solve this system?

Due to big big big system explicit is impossible.

and due to not being linear it can not be done by implicit=true.

Could you please help me?

How can  I solve this by maple?

Thanks,

A:=[X22(t) = 0, X26(t) = 0, X30(t) = 0, X34(t) = 0, X38(t) = 0, X42(t) = 0, X2(t) = X19(t), X5(t) = X23(t), X8(t) = X27(t), X11(t) = X31(t), X14(t) = X35(t), X17(t) = X39(t), X19(t) = X21(t), X23(t) = X25(t), X27(t) = X29(t), X31(t) = X33(t), X35(t) = X37(t), X39(t) = X41(t), X1(t) = Diff(X3(t), t), X4(t) = Diff(X6(t), t), X7(t) = Diff(X9(t), t),

I have a system of five big big big differential equations with a lot of Sin and cos. The system is not complex itself but we have complex  initial condtition?

How can I solve my system with maple with dsolve or something else?

Thanks

I have a lot of equations one of them is like "q:={3-x=1}"

if I use   switch:=z->lhs(z)-rhs(z); and I use map(switch,q); it gives me 2.-x which is bad for Bertini software which I use for some purposes. I need to have 2.0 or 2 but not 2.

This dot after 2 without any number after that is trouble for me.

What should I do?

Thanks

I have a differential equations system with initial condition which contains complex numbers, but there is an error which says "dsolve/numeric can not solve with complex number the system must be converted to real system".

What should I do? how do I solve a differential equations system with complex initial values with maple?

Thanks....