Help!

[Amanda Valenti]

several students are getting this error and I can't find any mistakes.  They have defined everything, no mispellings. 

TYPEERROR:  Cannot read properties of undefined (reading "*")

CODE:  object1.pos.x=object1.velocity.x * deltat + object1.pos.x

I have tried and checke everything and it seems to not like the *.  Looking for help! Thank you. 

[Joe Heafner]

Greetings.

I don't see any obvious errors, and that line works in an example I just coded up and tried. Can you please provide a link to the entire program or copy and paste into a reply?

Joe Heafner
Sent from one of my Macs

[Harlan Gilbert]

Are you sure that object1.velocity is defined as a vector?

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Harlan Gilbert, Ph.D.

High School Chair and Math, Physics, Computer Science, and Philosophy Teacher

Green Meadow Waldorf High School

Chestnut Ridge, NY 10977

(845) 356-2514 x. 320

[Joe Heafner]

> On Oct 25, 2022, at 14:12, Harlan Gilbert <hgil...@gmws.org> wrote:
>
> Are you sure that object1.velocity is defined as a vector?

It was in my example on my end, but when it's defined as a scalar, as in the example below, I do indeed get the same error message. I think that's the problem.

Web VPython 3.2

object1 = sphere(pos=vector(1,2,3),velocity=5)
deltat = 0.01

object1.pos.x = object1.velocity.x * deltat + object1.pos.x

print(object1.pos.x)

[Bruce Sherwood]

Good detective work! I'm surprised to see a statement updating only the x component of a moving object rather than using vectors: object.pos = object.velocity * deltat + object.pos

Bruce