Hi everyone 

I have a question regarding an animation. The maple file is attached at the bottom. (parts of it are from tomleslie 12910) 

I have two spheres which move and rotate over time. Now I would like to show one ball at a certain time and the other one at a certain time and not both over the whole animation.

For example:

x1 should only be shown and visible from time -1 to 0 

x2  should only be shown and visible from time 0 to 1 

Because I want to show a kind of transition from x1 to x2 at the time 0 i cannot just start one animation at -1 and the other at 0 because then they would run at the sime time which is not the goal. 

has anyone an idea?

Thanks in advance!

how_transition.mw

Hi everyone, I have a question regarding the time in a plot.

The idea behind is, that i dont have to adjust the time after every change of parameters.

I have a function that only is valid until a certain time. I evaluete the time until cut off for example like this:

tempLrest := Optimization:-Minimize(tempLrest(t), t = 0 .. 2);
              tempLrest := [2.47883089786094 10^-8  , [t = 0.414486068771508]]

cutoff := tempLrest[2];

Now i want to call "cutoff" in an odeplot like this: 

odeplot(sol1, [t, z(t)], 0 ..cutoff , size = [300, 300])

unfortunately this doesnt work. 

Does everyone know how to solve this problem?

Thank you in advance!

Hi everyone 

I have a problem regarding the animation of a flying ball. 

I get the coordinates and rotation in rad/s out of differential equations. Now I want to show the movement of the ball including the rotation in an animation. 

With just the coordinates it works just fine, but when I try do add the rotation the error message "number of elements in lust must be a multiple of 2" appears

I would be grateful for some advice. Thank you in advance.

I added my file, hope it helps.

how_rot.mw

Hi everyone 

I have a problem with an animation that I dont know how to solve. 

Let's say I have three sets of coordinates. (one static and two moving dependet on time)

1:= [x1;z1]

2:= [x2(t);z2(t)]

3:= [x3(t);z3(t)]

Now I want out of these 3 points two lines that are connected  with each other like this:

line 1:= 1 and 2

line 2:= 2 and 3

These lines should move over time in the 2d space. The only point that doesnt move is point 1. In the animation there should only be the 2 lines visible for each frame. (not a trace or something like this) 

does anyone have an idea how I solve this?

Hi everyone 

I solve several differential equations using dsolve. Now I want to change one initial condition a little bit: 

before: 

new: 

When solving the new system I am getting the error message: Error, (in dsolve/numeric/process_input) unknown piecewise(0 < 16-(xn(t)^2+(zn(t)-16)^2)^(1/2), 16-(xn(t)^2+(zn(t)-16)^2)^(1/2), 0) present in ODE system is not a specified dependent variable or evaluatable procedure

I am guessing this has to do with a function in an initial condition. 

Has anyone an idea how to solve this problem?

I added the maple file for the whole overview.

Thanks in advance!