Paulo Baumbach

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14 years, 276 days

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I have a PDE system that relates four functions: sht1, svt1, Lt1, Jirt1.

I'm trying to solve this system numerically, but the pdsolve command returns an error (this error does not make sense to me).

Where am I going wrong?

Thanks!

Test.mw

I'm trying to do something very simple, but I can not do it. I would like to fill the chart with colors of my choice.

restart: with (plots):
plots [animate] (plot, [[sqrt (x), sqrt (x) -1], x = 0..t, filled = true, view = [0..20, 0..5]], t = 0..20);

The filled = true option fills the graph with random colors.
I tried to use filled = ["Blue", "Red"], but that does not work.

Any tips?

Thank you

 

I am encountering problems solving a system of differential equations.

In the attached file, on the first try the boundary conditions are defined in H: = He, resulting in "Error, (in DEtools / convertsys) unable to compute coeff". On the second try, the boundary conditions are defined in H: = He + 0.00000000000000001 and this works.

What is the possible cause of the problem?

Thank you

problem.mw

I'm trying to solve an ODE system from an IVP problem, but the error occurs: "Error, (in ...) cannot evaluate the solution further left of ..., maxfun limit exceeded (see ?dsolve,maxfun for details)"

I've already tried modifying the maxfun value but this did not work. I would like some suggestion.

Thank you

ODE_System.mw

Is it possible to increase the execution speed of the dsolve command? For example, is it possible to increase speed with the use of Multithreaded tools?

Thank you for your help

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