1 years, 63 days

## simplification...

Its a good answer, I verified directly i find the same solution.

Using maple can we simplify diff(g(x),x) to get an answer using piecewise function maybe we can use convert diff(g(x),x) using piecewise function

Many thanks

## @John May  I agree with you, I can...

I agree with you, I can make test only with small vale of n =6 or 7

Maybe there are others methods to solve this system...

## @Markiyan Hirnyk  Many thank for y...

Many thank for your remarks but i tried the code , I get the following error :

Error, `DirectSearch` does not evaluate to a module

## @vv Yes that I mean. But maximization a...

@vv

Yes that I mean. But maximization and not minimization

I trided your code using maximization but there is display

## @Rouben Rostamian     If we ...

If we work using discrete dynamical system

we have S_t(x)=x^(0.5^t);

using this solution depend on t how can we say if a set if local attractor or not

## Error, `DETools` does not evaluate to a ...

I tried your code, i get the following error

Error, `DETools` does not evaluate to a module

With(DEtools);
DETools:-DEplot*(diff(x(t), t)-x(t), x(t), t = -1 .. 1, {x(0) = 1});

Many thanks

## @Kitonum  Thank you I agree with ...

Thank you

I agree with you.

But, I which case that the ODE may not have a solution.

Many thank

## @Mariusz Iwaniuk  Thank you for yo...

Thank you for your idea in this subject.

transonic gaz equation

I tried to solve the equation in a square with homogeneous boundary conditions

Can we put non-homogeneous boundary condition for the same PDEs, like

bc[2] := u(0, y) = a, u(1, y) = b, u(x, 0) = c, u(x, 1) = d;

where a,b,c and d are given real number

or maybe we can put a general function as boundary condition like

bc[2] := u(0, y) = f1(y), u(1, y) = f2(y), u(x, 0) = g1(x), u(x, 1) = g2(x)

where the four functions f1 g2 g1 ang g2 are given

Many thanks

## @Mariusz Iwaniuk  Thank you for th...

Thank you for the previous ideas presented to solve this problem.

## @vv  Its not less than one but you...

Its not less than one but you say  its less than one

In the vertical axis there are many point that the finction is not less than one

but in the horizontal axis the moduls of the function is less than one

## @Zeineb   how can i make a lo...

how can i make a loop on row or colunm to construct Anew matrix from A matrix

## @tomleslie  I would like Anew matr...

I would like Anew matrix from A matrix

## @Kitonum    Many thanks I h...

Many thanks

I have a second question: can we solve the same problem using matlab

## @Kitonum  Many thanks...

Many thanks

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