On Jan 26, 1:41 am, John Machin <[EMAIL PROTECTED]> wrote: > On Jan 26, 4:20 pm, Tim Rau <[EMAIL PROTECTED]> wrote: > > > > > Traceback (most recent call last): > > File "C:\Documents and Settings\Owner\My Documents\NIm's code\sandbox > > \sandbox.py", line 242, in <module> > > player = ship() > > File "C:\Documents and Settings\Owner\My Documents\NIm's code\sandbox > > \sandbox.py", line 121, in __init__ > > self.phyInit() > > File "C:\Documents and Settings\Owner\My Documents\NIm's code\sandbox > > \sandbox.py", line 147, in phyInit > > moi = cp.cpMomentForCircle(self.mass, .2, 0, vec2d((0,0))) > > ArgumentError: argument 4: <type 'exceptions.TypeError'>: expected > > vec2d instance instead of vec2d > > > As far as I can tell, It's getting a vec2d, and it wants a vec2d. I't > > seems like it doesn't know what it wants, but I thought only teenagers > > did that, no programming languages. > > It possibly means that it is expecting an instance of a class whose > name is "vec2d" but you have given it an instance of some *other* > class whose name just happens to be "vec2d". > > > clearly, Im missing something. > > Yes, some information: > 1. what is vec2d, class or function? > 2. what do you believe vec2d((0, 0)) should return? > 3. what is this belief based on? > 4. what has it actually returned this time? > 5. what do you believe that cp.cpMomentForCircle expects as argument > 4? > 6. what is this belief based on? > > The ArgumentError exception is raised by ctypes "when a foreign > function call cannot convert one of the passed arguments". Based on > guessin'n'googlin' the cp thing is a set of Python bindings to a > library written in C++ ... have you considered asking the author of > the bindings?
1. vec2d is a class, designed to hold and manipulte 2d vectors 2. it should return a vector with x=0 and y=0 3. That's what it's done before. 4. trying it in the interpreter seems to show that it returns a vec2d with zero length. as it should. 5.cp.cpMomentForCircle seems to expect a vec2d. I'm baseing that on a functioning demo that uses the exact same line. I guess that the vec2d I've got is not the one it wants. How do I tell the difference? I'll go look at all the imports. -- http://mail.python.org/mailman/listinfo/python-list
