what does Error, (in PDEtools:-casesplit) equation of unknown type integer :...
Maple 2019.1 with Physics version 362Â gives this strange error on this pde restart; pde := x*diff(u(x, y), x) + y*diff(u(x, y), y) = -4*x*y*u(x, y); ic := u(x, 0) = exp(-x);...
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Is it possible to obtain a simpler solution to this PDE in Maple?
Maple is very good in solving PDE's. But this specific solution seems way too complicated when compared to Matematica solution, which I verified using Maple pdetest to be correct.Is there a way to make...
View Article'0th zero of BesselJ(0,x) not defined' error from pdsolve
This is a new error I have not seen before.  Trying to verify my solution for the diffusion pde in cylinderical coordinates wth no angle theta dependency. unassign('z,t,r,u'); lap:=diff(u(r,z,t),r$2)+...
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a new problem in latex() command
I installed Physics package 368 and when I run a test, I found that now the latex() command fails with internal error which I have never seen before. I think this is first time I see latex() gives an...
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How to make solution of this PDE a function in order to evaluate it?
I got this solution from a PDE. I normally use unapply on the RHS of the solution to make it a function.But in this, the PDE solution contain some extra stuff at the end. Which "Where { .....}"So the...
View ArticleSolving a trivial pde in Maple 20018
Hi everybody,Im trying to solve the following trivial pde using Maple 2018pdsolve([diff(Y(x, t), t, t) = 0, Y(x, 0) = 0, (D[2](Y))(x, 1) = 0]);Obviuosly the solution is Y(x, t) = 0, but Mapple 2018 is...
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possible wrong solution by pdsolve
I solved this PDE by hand to verify Maple's solution. I think Maple solution is wrong. This PDE is the heat PDE on a bar (1D) with boundary coditions on both ends are function of time and zero initial...
View ArticleProblem with pdsolve command
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)....
View Articlepdsolve 2D equations with unknown parameter
is possible to pd solve following equation with unknown parameter omega.other parameter are constant.I see before for one dimension ode this type equation was solved.Now for 2d equation is...
View ArticleHomotopy Perturbation method
I'm currently working my thesis and can someone help me to write a code to solve this IVPu_t + 2×u²×u_x−(u_x)²−½×u_{xx}×u=0with initial conditionu(x,0)=-tanh(x)Â
View ArticlePDE with pdsolver
with(PDEtools); pde := diff(c(x, t), x, x) - h*diff(c(x, t), x) = diff(c(x, t), t):iv := c(0, t) = 0, c(a, t) = 0, c(x, 0) = c0:de := pdsolve([pde, iv], c(x, t), build);Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â de := (...
View ArticleUsing xx with pdsolve output = listprocedure
pde := diff(u(x, t), x $ 4) = diff(u(x, t), t $ 2);iv:= subs(L = 100, {u(0, t) = 0, u(L, t) = 0, u(x, 0) = sin(x), D[2](u)(x, 0) = 2*x, D[1, 1](u)(0, t) = 0, D[1, 1](u)(L, t) = 0});de := pdsolve(pde,...
View ArticleElliptical PDEs
pde := (diff(u(r, theta), r) + r * diff(u(r, theta), r, r) + diff(u(r, theta), theta, theta) / r ) / r: iv := u( 1, theta) = 0, u( 3, theta) = theta, u( r, 0) = 10, u( r, Pi/2) = 0:Â Â Â Â Â Â Â Â Â Â Maple...
View ArticleWhat is the problem in the following code to solve given PDE?
What is the problem in the following code to solve given PDE?pde_question.mwThanks.Â
View Articlesolve PDE with Runge-Kutta method
Hi everybody?how can I solve this PDE with Runge-Kutta method and 2D plot in terms of w(x,t) , t and 3D plot in terms of t, x, w(x,t)?code1.mw
View ArticleDiffusion Equation - inverse solution for finding the diffusion coefficient
Hello everyoneI have the solution of diffusion equation from Help of maple website. I put the code here*****************************restart: with(plots):Â unprotect(D);Â alias(c[0]=c0, c[1]=c1, c[2]=c2);...
View ArticleMaple can't solve my partial differential equation
hi i did this in maple and i get an error when i try to solve the system of equation :restart; with(Student[VectorCalculus]); with(PDEtools);with(plots);h_f := 300; h_a := 1000; T_f := 1500 + 273; T_a...
View Articlereverse solution of diffusion equation
Hello allI am going to find the diffusion constant in the following equation :PDE:=diff(C(x,t),t)=d*diff(C(x,t),x,x);In a way that ,evalf(Int(C(x,t=specific),x=0..L))/L - m_number(t=specific)=0Â In...
View ArticleDirichlet conditions and Neumann values
Does anyone know how to enter in the pdsolve function Dirichlet conditions and Neumann values?Oliveira.
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Derivative with numerical method
 > > > > > (1)> (2)> (3) Using numerical methods, I cannot calculate the derivative of sd with respect to r at r = 2 and t = 4.Oliveira.>  Download Derivative-numerical.mw
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