## 136 Reputation

15 years, 95 days

## How can I solve a system of DAEs which i...

Maple

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.

How can  I solve this by maple?

Thanks,

## how can I find index of something in a l...

Maple

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),

## How can I solve a system of Differential...

Maple

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

## digits...

Maple

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

## how can I convert a DAE system with comp...

Maple

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....

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