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 <moorepa...@gmail.com> 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 <(530)%20601-9791>
>
> On Mon, Jul 17, 2017 at 11:11 AM, <shoulddt...@gmail.com> 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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