## why convert(..,Int) does not work for invlaplace?...

convert(...,Int) in Maple 2018.2 works for fourier, invfourier, laplace, but does not work for invlaplace.

Why is that? Is there a workaround?

```expr:=fourier(f(x), x, w):
convert(expr,Int);
```

```expr:=invfourier(f(w), w, x):
convert(expr,Int);
```

```expr:=laplace(f(s),s,t):
convert(expr,Int)
```

```expr:=invlaplace(f(s),s,t):
convert(expr,Int)
```

Was expecting to see the Mellin's inverse formula.

Maple 2018.2 on windows 10

## How calculate the Skyrme of motion from the Lagran...

How can I calculate the Euler-Lagrange equation from the Lagrangian density from Gauged Baby Skyrme model in maple using the physics package? Here, the rules of the operation in the inner space are the same that of the vectors conventional: dot and cross products, etc...
Following below the Lagrangian density.

Errata:

Hello,

every time I input a formula I get:

Typesetting:-mparsed(x^2 +5 -2,x^2+3; "_noterminate")

I can't get rid of this error: this is very basic, what happened?

TIA, Roberto

## how i can Substituting......

i want to gain diff(p(t), t) and diff(q(t), t) and Jacobian matrix
according to the attached pdf file.

thanks

 >
 (1)
 >
 (2)
 >
 (3)
 >
 (4)
 >
 (5)
 >
 (6)
 >
 (7)
 >

## How do I run coding with goto on Maple? ...

Hi, I'm using Maple 2018 and I tried to run coding from https://www.maplesoft.com/applications/view.aspx?sid=4194&view=html

however, it said : unable to parse. I figured out that the problem maybe is in the if loop. though it seems perfectly fine, but it has some goto commands that i cannot search on maple website. does this mean that the goto cannot be used here and should be replaced? if yes, then how?

i am still learning on how to use maple. any help would be much appreciated. thank you!

this is the coding for if loop:

label_7;

rv:=vector([p1(x1pt,x2pt),p2(x1pt,x2pt)]):

numgeval:=numgeval+1;

printf("%5d (%8.4f,%8.4f)",numIter,rv[1],rv[2]);

max:=n;

mg:=convert(sqrt(dotprod(rv,rv)),float);

printf("%12.4f",mg);

if(mg<tol or numIter>=max) then

goto(label_6);

else

numIter:=numIter+1;

fi;

v1:=x1pt+t*rv[1];

v2:=x2pt+t*rv[2];

newt:=evalf(subs({x1=v1,x2=v2},f1));

numfeval:=numfeval+1;

lam:=fsolve(diff(newt,t)=0,t,maxsols=1);

nv1:=evalf(subs({t=lam},v1));

nv2:=evalf(subs({t=lam},v2));

printf(" (%8.4f,%8.4f)%13.4f\n",x1pt,x2pt,lam);

x1pt:=nv1;

x2pt:=nv2;

goto(label_7);

label_6;

printf("\n\n-----------------------------------------");

printf("---------------------------------------------");

printf("\n\n Approximate Solution: ");

printf(" (%8.4f,%8.4f)\n",x1pt,x2pt);

Fvalue:=evalf(subs(x1=x1pt,x2=x2pt,f));

printf(" Maximum Functional Value: ");

printf("%21.4f",Fvalue);

printf("%22d",numgeval);

printf("\n Number function evaluations:");

printf("%22d",numfeval);

printf("\n\n-----------------------------------------");

printf("---------------------------------------------");

end:

## simplify an equation ...

hi.

According to the fhgure attaceh how i can gain the equation (2-27) . I write the equation (2-26) in maple but I couldnot to gain that result.

If possible to reach equation via maple?

Thanks

 (1)

 (2)

## pdsolve does not work...

why pdsolve does not work?

Q and alpha are constant. I want to find f(x,y).

Thanks

 (1)

 (2)

## Statistics:-Mean fails...

Hi,

I submit you this strange result:
for somenumerical  values of a, b, c  (a, b, c real and b > a), Maple 2018 is not able to compute the mean of
c*U where U is a Uniform random variable with support [a, b].

 > restart:
 > with(Statistics):
 > interface(version);
 (1)
 > z := .4070716688*RandomVariable(Uniform(0.12-0.02*0.12, 0.12+0.02*0.12)); Mean(z);
 > z := .4070716688*RandomVariable(Uniform(a, b)); Mean(z); subs({a=0.12-0.02*0.12, b=0.12+0.02*0.12}, %);
 (2)
 >

PLEASE: Maple still fails if I replace  a = 0.12 -0.02*0.12 by its value 0.1174
and b = 0.12+0.02*0.12 by its value 0.1224

This is incomprehensible and could hide a more profound problem.

## Expressions in procedures acting unevaluated when ...

What's going on here? Am I missing something, or is it a bug? If it's a bug, then it's by far the deepest and most profound bug that I've ever found or seen in Maple (and I've seen thousands over the decades). And since that surprises me, my guess is that I'm missing something obvious.

```restart:
Op:= (R,F)-> F(['R()'\$2]):
Op(rand(1..9), [f,f]);
[f([7, 6]), f([2, 4])]
```

The expected output is [f([7,6]), f([7,6])]. The same thing happens if I replace with seq, or if I replace -> with proc.

## How do i make a subsection on mac, Maple 2018...

The question is all in the title really. I am struggling to make a subsection on my macbook, using 2018 Maple software. The cmd + shift + . will only make sections, regardless of where i place my cursor.

## K & C syntax not + & -...

Hi

I am having problems with the syntax/symbols i maple. I down know what "setting" has changed but + and - and so on, has change to K and C. anyone know how to fix this?

Regards

Morten

## How do I fix my corrupted file?...

I get this message everytime I am trying to open my worksheet: "Recover Corrupt File and Save As"

2.G_anden_aflevering.mw

## system of nonlinear ordinary differential equation...

I want to solve system of nonlinear ordinary differential equations numerically using the variational finite
element method (FEM). is it possible to solve on Maple? If anybody have a idea please share with me. I attach the image of my problem which I am tryimng to solve.