visualpython-users

[Visualpython-users] can't change vector's magnitude in VP 2.97

[Joe H. <hea...@ct...>]

I'm using VPython 2.97 compiled from source under Mac OS 10.3.4. Today 
I tried to run an existing program that worked under the previous 
version and it bombed on the line:

pt.mag = pt.mag + c * dt

where pt is a previously defined vector and c and dt are scalars. The 
error  message I get is

Traceback (most recent call last):
   File "/Users/joeheafner/Desktop/Joe_Radiation.py", line 134, in 
-toplevel-
     pt.mag = pt.mag + c * dt
AttributeError: can't set attribute

The mag attribute seems to be the problem but it's still documented as 
working. Any ideas? I'll supply more details if requested.

Cheers,
Joe Heafner -- Astronomy/Physics Instructor (by some definitions)

Re: [Visualpython-users] can't change vector's magnitude in VP 2.97

[Jonathan B. <jbr...@ea...>]

On Mon, 2004-08-02 at 21:54, Joe Heafner wrote:
> I'm using VPython 2.97 compiled from source under Mac OS 10.3.4. Today 
> I tried to run an existing program that worked under the previous 
> version and it bombed on the line:
> 
> pt.mag = pt.mag + c * dt
> 
> where pt is a previously defined vector and c and dt are scalars. The 
> error  message I get is
> 
> Traceback (most recent call last):
>    File "/Users/joeheafner/Desktop/Joe_Radiation.py", line 134, in 
> -toplevel-
>      pt.mag = pt.mag + c * dt
> AttributeError: can't set attribute
> 
> The mag attribute seems to be the problem but it's still documented as 
> working. Any ideas? 

Here's one: "I made a mistake."  This and a few more bugs will be fixed
in a point release later this week.

-Jonathan