## 13 Reputation

17 years, 14 days

## what's wrong with this pde?...

Maple

> restart; with(plottools);

> U := u(x, t);

> pde := (diff(U, `\$`(x, 2)))/(2*x)^2 = (1/1250)*(diff(U, `\$`(x, 2)))+(1/9)*sin(0.10e-1*Pi*t)*exp(0.10e-1*Pi*t^2);

ic := u(x, 0) = x^2, (D[2](u))(x, 0) = 1;

bc := (D[1](u))(0, t) = 0, u(1, t) = 1;

> S := pdsolve(pde, {bc, ic}, numeric);
Error, (in pdsolve/numeric/par_hyp) Incorrect number of initial conditions, expected 0, got 2
...

## 2d wave equation problem...

Maple

what am i doing wrong???

> restart;
> with(PDEtools);
> a := 3;
> U := u(r, t);
> wave := a^2*(diff(U, r\$2))+(diff(U, r))/r) = diff(U,t\$2));
> ics := u(1, t) = 0;
> bcs := diff(U, t) = piecewise(0<= r <b,-2, b<= r<1,0), u(r, 0) = 0;
> s := pdsolve(wave, {bcs, ics});

Error, (in pdsolve/sys) too many arguments; some or all of the following are wrong: [{u(r, t)}, {u(1, t) = 0, u(r, 0) = 0, diff(u(r, t), t) = -2}]

## Earthquake!!! Help!!!!!!...

Maple

DOES ANYONES HAS THE SLIGHTEST IDEA OF HOW I COULD MODEL AND SUMILATE THE WAVE PATTERN OF A REGISTERED EARTHQUAKE??? FOR INSTANCE I AM STUDYING THE EARTHQUAKE EFFECTS OF THE NOVEMBER QUAKE IN GUATEMALA OF LAST YEAR. I WOULD LIKE TO MODEL THE MOVEMENT OF THAT QUAKE OVER A GIVEN AREA NEAR THE EPICENTER.

ANY HINTS OF HOW I COULD EVEN START TO MAKE THE MODEL AND SIMULATE??

## animation to video...

Maple 15

hey guys, i need to do a couple presentations where i need to present some animations of equations such as

f(x) := a*(2*x^3 + x^2 - 3*x)    a=1..10

the question is how can i take the animation provided by maple and convert it to a some sort

of video file such as and .avi file??

## partial differential equations...

Maple

how can i input and solve  the one dimensional wave equation with intial and boundry conditions???

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