## Simple graphical interface in Maple ...

How i need to write

>teksbiasa:=`Hello! Bob`;

in button Action When Clicked at simple graphical interface instead of

Do(teksbiasa=%txtTeksBiasa);

because when i enter Hello! Bob in %txtTeksBiasa, system pop up ERROR

Error

Error in Component button with caption "Botton":

(in unknown) incorrect syntax in parse: missing operator or

`;`(near 7th character of parsed string)

Thank you~=]]

## Plotting problem...

I have the following problem : plotting with the squareroot function somehow stops showing the whole graph as soon as the range of the input allows values less than -10, I have attached two pictures that show the transition:

This is still fine:

But here is an example where the graph is cropped:

How can I change this to get the whole graph ? Thanks a lot for your help !!

## Nested for loops...

So, I am working in a partial differeital equations course and we are doing image processing. I am taking an image and pixel by pixel applying the heat equation to smudge out noise. I created a for loop for the equation and it works, I need to itterate it over and over again. Here is my code:

for t from 1 to 20 do

for j from 2 to 149 do

for k from 2 to 149 do

`tile2__j,k`:=dellT/(h^(2))*(`tile__j+1,k`-4*`tile__j,k`+`tile__j-1,k`+`tile__j,k-1`)+`tile__j,k`

end do

end do

for m from 2 to 149 do

for n from 2 to 149 do

`tile__m,n`:= `tile2__m,n`

end do

end do

t := t+1

end do

Sorry, I could not get the Maple Math editor to work so I just copied my code. Apologize. I keep getting the error "Error, Invalid loop statement termination." Help?

## Problem with implicitplot3d...

Hi, I have defined two functions:

ex1 := (x,t,z) -> -1.132*10^(11)* exp(9.9*10^(6)*x)*exp(sqrt(-1)*(1.95*10^6*z-2.98*10^15*t))

ex2 := (x,t,z) -> -2.82*10^(12)* exp(2*10^(6)*sqrt(-1)*x)*exp(sqrt(-1)*(1.95e*10^(6)*z-2.98*10^(15)*t));

And then tried the command:

implicitplot3d( ex1, x = -10..0, t = 0..10, z = 0..10, axes = boxed, style = patchcontour, scaling = constrained, shading =z);

But the boxes are entirely blank! What is the problem here?? It should be some kind of sine curve

## Modelling solitons...

Hi guys, I'm currently having a lot of trouble with Maple and can't seem to get stuff to work. I have the task of solving and modelling the Klien Gordon equation, with a chosen potential. The equation I'm trying to solve is:

> KGE := diff(psi(x, t), x, x)-(diff(psi(x, t), t, t))-12*psi(x, t)^5+10*psi(x, t)^4+6*psi(x, t)^3-3*psi(x, t)^2-psi(x, t) = 0

I'm doing this by changing the pde into an ode via a transformation

>tr := {t = tau, x = c*tau+z, psi(x, t) = U(z)}

>ode1 := dchange(tr, KGE, [z, tau, U(z)])

>ode1 := collect(ode1, diff(U(z), z, z))

>c := 1/4

>ode2 := subs({U(z) = U, diff(U(z), z, z) = V(U)*(diff(V(U), U))}, ode1)

>sol := dsolve({ode2, V(0) = 0}, V(U))

>sol1:= sol[2]

>z := -c*t+x = int(1/rhs(sol2), U)

>solwave := psi(x, t) = solve(z, U)

I then checked if my solution, solwave actually solved the pde via pdetest(solwave,KGE) and it did. Hence this is what I took as one of the kinks. Although the kink solution looks hideous and I have no idea how to try and take the limit as x goes to infinity, as to show it tends to a vacuum of the potential. I've tried taking the limit but all Maple does is replace all the x with infinity signs...

I then tried animating it to see if it worked, but it just looks wrong, there are breaks within the curve and also very random spikes which I cannot explain at all..

I tried this code exactly for the Sine Gordon equation and it works perfectly, it just all goes wrong when I try to change the potential.

Here is a picture of the frame:

----------------------------------------------------------------------------------------------

Another issue I had was with dealing with the potential on it's own, every time I try inputting

>1/2(u^2)(1-u)^2(1+2u)^2

into maple it changes the expression into something completely different and wrong, it somehow comes out with an exponential of 8.. This is what I get:

(1/2)*(u(1-u))(1+2*u)^8

----------------------------------------------------------------------------------------------

I also have a problem integrating, I try and plug in a value, i.e.

>int(1/(x(1-x))(1+2*x), x)

but all this does is show me what I inputted but with a integral sign...

I'm very very new to Maple and have spent over a week doing this, but it just isn't working out at all :( Please help!!

## Function "subs repeated"...

Hello,

I look for a maple function / or a piece of code which enable to do repeated substitutions. In other words, repeat substitutions until there is no more possible substitution.

How can I do to make repeated substitutions ?

Here a example I would like to solve with maple

Equation on which I would like to conduct variables changements:

 Code: eq := sin(psi[1](t)+gamma0(t))*cf+sin(gamma0(t)+theta[1](t)+psi[1](t))*mf-sin(gamma0(t))*hf-cos(gamma0(t))*lf+xp[1](t) = sin(psi[2](t)+gamma0(t))*cf+sin(gamma0(t)+theta[2](t)+psi[2](t))*mf-sin(gamma0(t))*hf-cos(gamma0(t))*lf+xp[2](t)

Definition of variables changement :

 Code: ChgtVariables:=psi[1](t)=Psi[1](t) - theta[1](t) + gamma[1](t),psi[2](t)=Psi[2](t) - theta[2](t) + gamma[2](t);psi[3](t)=Psi[3](t) - theta[3](t) + gamma[3](t),psi[4](t)=Psi[4](t) - theta[4](t) + gamma[4](t),theta[1](t)=Theta[1](t)+gamma[1](t),theta[2](t)=Theta[2](t)+gamma[2](t),theta[3](t)=Theta[3](t)+gamma[3](t),theta[4](t)=Theta[4](t)+gamma[4](t);

Application of subs function:

 Code: subs(ChgtVariables,eq);

The problem is that only one step of substitutions is conducted.

Here the expected result :

(sin(theta[1](t))-theta[2](t))*cf - (sin(gamma[1](t)-sin(gamma[2](t)))*mf  + xp[2](t) - xp[1](t) = 0

Thanks a lot for your hemp

## Why Unexpected Lack of Output?...

Here is my Maple 16 code:

I expected to get outuput

a [a,b,c]

a [a,c,b]

But I get no output.

Why?

## How do I fill an Array?...

Hi,

I'm trying to fill an Array but I don't know the correct syntax, and Maple help isn't much use.

How do I form an Array, A, which has 10 rows and 2 columns. Where one column is say the row number squared and the other column is the row number cubed.

So A would be:

[1 1]
[4 8]
[9 27] .....

Also, I'm using the square and cube numbers as an example. But is there a general format for doing this, whatever the values I want to put in the array are?

Thanks

## Evaluation gone wrong...

Why does "eval(c, [b=1,l=1])" turn out to be "1" not "1/1+x"??? its driving me cracy. THX

 > restart
 >
 > a:=(1/(1+x/l))
 (1)
 > eval(a, [l=1])
 (2)
 > eval(a, [x=2,l=1])
 (3)
 > c:=(1/b(1+x/l))
 (4)
 > eval(c, [b=1,l=1])
 (5)
 >

## Error when plotting spacecurve...

I have:

r:=t-><4cos2t+4sint,5cos3t+4cost,(sin3t+2sint)^2>

with(plots):

then I tried:

spacecurve(r(t), t = 0 .. 2*Pi, thickness = 2, color = black, axes = normal, labels = [x, y, z], numpoints = 150)

But I keep getting the error: Warning, unable to evalute the function to numeric values in the region.

But I thought <4cos2t+4sint, 5cos3t+4cost, (sin3t+2sint)^2> was defined on the region t=0 to 2Pi???

I'm using Maple 2015 if that helps.

## Error in dsolve...

hello

i write this set of differential equation in maple and get the following error?

Can anyon help me with this?

thanks

## Help with optimization...

I've got this huge chunk of code which leads to an optimiazation at the very last line (Bestangles:=minimize(maximize()-minimize))). This minization is taking a very long time (havent solved it yet) and I would very much like to reduce that time. As I've understood maple does optimization by differentiating and then finding all extremes and comparing. Would this mean that since I minimize and optimize within a minimization command, it differentiates a ton of times? And if this is the case, can I somehow do the differentiation beforehand, since it is the same function being differentiate all the time? Or is there some other way I can improve the code?
Thanks alot!

Heres the full code:

## Error in Optimization:-Maximize...

So I am trying to apply the Optimization function to a rather complicated problem I am currently working on, and having some trouble getting maple to cooporate. This is the part of the code that is giving me the error, with error included. All of the variables imputtet when calling OptimizeSpring are constants. If there is any other details I should add, please say so and I will add them promptly :) Thanks alot!

I suspect that it might be related to this suggestion, but I am not sure how to apply it http://www.mapleprimes.com/posts/95113-Optimization-Workaround-For-Operator-Form

## How to evaluate the double integral?...

I would like to plot the following singular double integral, but I cannot due to singularities...

where x>0, t=0.2 and m=0.2.

I defined f(y) function as f:=y->exp(-(y-4.68)^2/0.4):

I attached my file:
1st_try.mw

Thank you !