## 185 Reputation

9 years, 217 days

## how to animate a bouncing ball on a 3d s...

I do not have any code to produce yet.  I want to have Maple animate a bouncing ball on some 3d surface.

## change direction of normal in PlotPositi...

There are two normals to a point on a curve.  How do I get the PlotPositionVector of Student[VectorCalculus] to point in the other direction.

with(Student[VectorCalculus]:

R1:=PositionVector([p,p^2],polar[r,t]):

PlotPositionVector(-R1,p=1..2,normal=true,points=[1.5])

The normal vector points towards the insided of the curve.  Can I use PlotPositionVector to have it point the opposite way (towards the outside of the curve)?

## How do I know if I have the latest Maple...

Maple

How do I know if I have the latest Maple build id?  What is it now?

## Joining unbalanced lists...

If I have several sets of listed data of different lengths,

a1:=[1,2]
a2:=[5,3,4,5]
a3:=[4,8,4,5,3,2,3,4,5]
a4:=[2,2,5,4,7,8]
...

How do I join the 1st positions into one variable and the 2nd positions into another and so on?

## find words in dictionary...

How do I find all words beginning with "FL" and ending in "S" ?

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