Plotting help

[Kevin Goldstein]

I'm trying to write some simple code to show a plot of Mechanical Energy, Potential Energy and Kinetic energy.  For starters, I've just at a ball going up and down.

The following code :https://trinket.io/library/trinkets/355441942b

works as expected.

The problem is that when add the option fast=False  on line 13 (see https://trinket.io/library/trinkets/2864ebab2f) I get the error:

Cannot read properties of undefined (reading 'type') At or near line 26: Pot.plot(ball.pos.y,V)

Any suggestions on what I might be doing wrong?

[Bruce Sherwood]

You're not doing anything wrong. By an extraordinary coincidence, this afternoon I was working on a very similar program and encountered the very same problem. There is a bug that fast=False fails in the presence of dot=True. Apparently you and I are the first people to try this combination (or others never reported it).

Bruce

[Kevin Goldstein]

Thanks Bruce 

That is very helpful - I thought I was making some obscure error with data typing - one of the things I enjoy about Python is that one usually doesn't have to worry about data types. 

I tried to get around the bug by removing the dot=True option independently plotting a moving dot using an additional gdots() plot  (see https://trinket.io/library/trinkets/2864ebab2f)

The same bug appears when one sets fast=False

cheers

Kevin

On Thu, 16 Feb 2023 at 02:25, Bruce Sherwood <bruce.s...@gmail.com> wrote:

You're not doing anything wrong. By an extraordinary coincidence, this afternoon I was working on a very similar program and encountered the very same problem. There is a bug that fast=False fails in the presence of dot=True. Apparently you and I are the first people to try this combination (or others never reported it).

Bruce

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