## Updating a maple document code from 2014 to 2022 v...

Hello everyone! I have found this document from Maple 18 (2014) that will be very usefull for my school work, but when i copy it into Maple 2022 i get the error message, "action, does not evaluate to a module" Is there any way for me to fix this? What i have been able to read is that i have to go in and update the code, but i have absolute no idea on how to do it?

Kind Regards Samuel

Regressionmodeller._Skal_laves_til_maple_22_og_23.mw

## How to plot this equation?...

could any one help  to plot this.

Here is my code.

PWS.mw

I need to make the graph i have attached match the image below.

## Is there any bug in the "randpoly" command?!!...

 >
 >
 >
 >
 >
 >
 {--> enter randomzero, args = [x, y]
 <-- exit randomzero (now at top level) = [x^2-y-4, y^3-3*x]}
 (1)
 >

Hi

I think there is a bug in the "randpoly" command. please see the attached file line 7 of my procedure "randomzero". Why x^2-y-4 is created while terms=1 is considered and the outputs must contain binomial?

## How to do this?...

How to get U1,U2,..I dont know how to use this inverse transform.Please help to find the series.

CM.mw

## I want to obtain equilibrium solutions and analyze...

Equilibrium._solutions.mw

I need to obtain the equilibrium solutions when infection is present as well as analyze the local asymptotic stability when infection is absent and present in the system

## Non-Dimensionalisation of PDEs...

Hi, please can someone help on how non-dimensionalize PDEs.

I have tried the following, but is not working:

restart:
eqn := (diff(theta(x, z, t), x))^2*(K[1]-K[3])*cos(theta(x, z, t))*sin(theta(x, z, t))+(diff(theta(x, z, t), x))*((diff(theta(x, z, t), z))*(-K[1]*cos(2*theta(x, z, t))+K[3]*cos(2*theta(x, z, t)))-(1/2)*gamma[1]*(4*sin(theta(x, z, t))^2*u(x, z, t)+2*u(x, z, t)*cos(2*theta(x, z, t))))+(diff(theta(x, z, t), z))^2*(K[3]-K[1])*cos(theta(x, z, t))*sin(theta(x, z, t))-(1/2)*gamma[1]*(diff(theta(x, z, t), z))*(4*sin(theta(x, z, t))^2*v(x, z, t)+2*v(x, z, t)*cos(2*theta(x, z, t)))+(diff(theta(x, z, t), z, x))*(-2*K[1]+2*K[3])*cos(theta(x, z, t))*sin(theta(x, z, t))-(diff(u(x, z, t), z))*((1/2)*gamma[2]*cos(2*theta(x, z, t))+(1/2)*gamma[1]*(2*sin(theta(x, z, t))^2+cos(2*theta(x, z, t))))-(diff(v(x, z, t), x))*((1/2)*gamma[2]*cos(2*theta(x, z, t))+(1/2)*gamma[1]*(-2*sin(theta(x, z, t))^2-cos(2*theta(x, z, t))))-(1/2)*gamma[1]*(4*sin(theta(x, z, t))^2*(diff(theta(x, z, t), t))+2*(diff(theta(x, z, t), t))*cos(2*theta(x, z, t)))+((diff(u(x, z, t), x))*gamma[2]-(diff(v(x, z, t), z))*gamma[2])*cos(theta(x, z, t))*sin(theta(x, z, t))+f[2](theta(x, z, t))*(diff(theta(x, z, t), x, x))+f[1](theta(x, z, t))*(diff(theta(x, z, t), z, z));

varchange := {t = T*tau, u = xi*h^2*U/alpha[4], v = xi*h^2*V/alpha[4], x = X*h, z = Z*h, K[3] = K[1]*k[3], f[1] = K[1]*F[1], f[2] = K[1]*F[2], gamma[1] = mu*Gamma[1], gamma[2] = mu*Gamma[2]};

PDEtools:-dchange(varchange, eqn, [tau, U, V, X, Z, k[3], F[1], F[2], GAMMA[1], GAMMA[2]]);

## how can i label in x-y axis with command?...

i want to label x,y axis with command...if i use manually ..i always need to do again after running..so how can i label x,y axis in this plot...? i watch manual and i din't find for axis..stress-strain.mwstress-strain.mw

## how to plot this equation?...

in this equations...how to plot (a,e)? thank you guys

plot.mw

## How to fix a curve...

Can you change f(eta) to upflow curve and theta(eta) to downflow curve.

In my Problem,Boundary Conditions are

theta(infinity) = 0, (D(f))(infinity) = 1 , (Take, eta =infinity)

Flows will be correct for what value is taken for infinity .

I take  eta = 5. and also tried changing ranges  but could't find it.Please Help to fix the curve.

my code is,

SM.mw

## How do I solve ODE system?...

How to solve ordinary differemtial equation system with initial conditions and boundary conditions. Here, some initial conditions are unknown variables. So how to find these  values of parameters.

eq1 := diff(f(x), x, x, x)+(1/2)*cos(alpha)*x*(diff(f(x), x, x))+(1/2)*sin(alpha)*f(x)*(diff(f(x), x, x)) = 0;

eq2 := diff(g(x), x, x)+diff(g(x), x)+(diff(g(x), x))*(diff(h(x), x))+cos(alpha)*x*(diff(g(x), x))+sin(alpha)*f(x)*g(x) = 0;

eq3 := diff(g(x), x, x)+diff(h(x), x, x)+1/2*(cos(alpha)*x+sin(alpha)*f(x)) = 0

ics:=f(0)=0, f'(0)=1, f''(0)=a[1], g(0)=1, g'(0)=a[2], h(0)=1, h'(0)=a[3];

bcs:=f(x) , g(x), h(x) tends to 0 ad x tends to infinity

## Error, invalid input: diff expects 2 or more argum...

Maple code for the problem is

TFBE.mw

## How to plot this Differential equations in any Num...

Could you please give maple code for Shooting Method/Kellor box Method or any numerical method except RK Method to this system of Differential Equations.

SMMS.mw

## How to solve this error...

Can you give the maple code for Shooting method/ Kellor Box Method for this problem.

mvp-1.mw

## How do I label the curves in Maple graph...

How do I label the curves in Maple graph.

Please, I need commands to tweak my maple 18 graph.

## How do I find a unknown values in boundary value p...

I have some ODE system contains unknown variables with  boundary conditions  (see the attachment). How to solve these system and find the vales of unknown variables.

In this problem, the boundary conditions tends to 0, when x tends to infinity.  BVP_with_parameters.mw

 (1)

 (2)

 2 3 4 5 6 7 8 Last Page 4 of 87
﻿