Sorry, ignore that error. When copying the code I left parts out to
simplify it, however I took the like declaring that variable out by
accident. Thanks for the advice. I will try working with one type.
On Monday, July 17, 2017 at 7:55:06 PM UTC-4, Jason Moore wrote:
>
> Also, I get this error when trying to run you code:
>
> ---------------------------------------------------------------------------
> NameError Traceback (most recent call last)
> <ipython-input-1-ee4045953474> in <module>()
> 30
> 31 # Set Positions
> ---> 32 ChassisC.set_pos(GlobalCoord0,(ChassisDeltax * inertial_frame.x +
> ChassisDeltay * inertial_frame.y + ChassisDeltaz * inertial_frame.z))
> 33 CGpos.set_pos(ChassisC,(CGposx * Chassis_frame.x + CGposy *
> Chassis_frame.y + CGposz * Chassis_frame.z))
> 34 LUCAMP.set_pos(ChassisC,(LUCAMPx * Chassis_frame.x + LUCAMPy *
> Chassis_frame.y + LUCAMPz * Chassis_frame.z))
>
> NameError: name 'ChassisC' is not defined
>
> moorepants.info
> +01 530-601-9791
>
> On Mon, Jul 17, 2017 at 4:53 PM, Jason Moore <moore...@gmail.com
> <javascript:>> wrote:
>
>> One issue you may be having is the mixture of sympy.vector,
>> sympy.physics.vector, and sympy.geometry. These packages are not designed
>> to work with each other currently. I recommend sticking to one of those
>> depending on what you are trying to do.
>>
>> moorepants.info
>> +01 530-601-9791
>>
>> On Mon, Jul 17, 2017 at 11:11 AM, <shoul...@gmail.com <javascript:>>
>> wrote:
>>
>>> Hello all,
>>> I am trying to use Sympy to model a multi-body dynamic system. I am
>>> trying to create the required points and coordinate systems to model the
>>> system in 3d. I am running into trouble creating symbolic points in 3
>>> dimensions. I can create the points as shown below, but whenever I attempt
>>> to perform a math operation on the points, such as deriving the midpoint or
>>> distance, I receive an error saying that "Point" is an unsupported type, or
>>> that the "Point" has no x-attribute.
>>>
>>> What is the correct method for declaring a 3 dimensional point
>>> symbolically, so that you can reference each component of it and perform
>>> operations to it? After declaring the point, I need to use the .set_pos
>>> function or an equivalent function to declare the position of the points.
>>>
>>> from __future__ import print_function, division
>>> from sympy import symbols, simplify, Segment
>>> from sympy.geometry import Point3D
>>> from sympy.vector import *
>>> from sympy.physics.mechanics import dynamicsymbols, ReferenceFrame, Point
>>> from sympy.physics.vector import init_vprinting
>>> init_vprinting(use_latex='mathjax', pretty_print=False)
>>>
>>> # Declare reference frames
>>> inertial_frame = ReferenceFrame('inertial_frame')
>>> Chassis_frame = ReferenceFrame('Chassis_frame')
>>> LUCA_frame = ReferenceFrame('LUCA_frame')
>>>
>>> # Define the rotation angle symbols
>>> thRoll, thPitch, thYaw = dynamicsymbols('thRoll, thPitch, thYaw')
>>> thLUCAy = symbols('thLUCAy') ; thLUCAz = symbols('thLUCAz')
>>> thLUCAx, thLLCAx, thRUCAx, thRLCAx = dynamicsymbols('thLUCAx, thLLCAx,
>>> thRUCAx, thRLCAx')
>>>
>>>
>>> # Define Position Components
>>> ChassisDeltax = symbols('ChassisDeltax')
>>> ChassisDeltay = symbols('ChassisDeltay')
>>> ChassisDeltaz = symbols('ChassisDeltaz')
>>> CGposx = symbols('CGposx')
>>> CGposy = symbols('CGposy')
>>> CGposz = symbols('CGposz')
>>> LUCAMPx = symbols('LUCAMPx')
>>> LUCAMPy = symbols('LUCAMPy')
>>> LUCAMPz = symbols('LUCAMPz')
>>>
>>> # Set Positions
>>> ChassisC.set_pos(GlobalCoord0,(ChassisDeltax * inertial_frame.x +
>>> ChassisDeltay * inertial_frame.y + ChassisDeltaz * inertial_frame.z))
>>> CGpos.set_pos(ChassisC,(CGposx * Chassis_frame.x + CGposy *
>>> Chassis_frame.y + CGposz * Chassis_frame.z))
>>> LUCAMP.set_pos(ChassisC,(LUCAMPx * Chassis_frame.x + LUCAMPy *
>>> Chassis_frame.y + LUCAMPz * Chassis_frame.z))
>>>
>>> # Center of Mass Locations
>>> CoM_Chassis = Point('CoM_Chassis')
>>> CoM_Chassis.set_pos(CGpos,0)
>>> CoM_LUCA = Point('CoM_LUCA')
>>> CoM_LUCA.set_pos(LUCAMP, ((LUCA_xOff / 2) * LUCA_frame.x + (LUCA_L / 2)
>>> * LUCA_frame.y + 0 * LUCA_frame.z))
>>>
>>>
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>>
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