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summer_2018:vpython_tips [2018/06/20 17:15] tallpaul |
summer_2018:vpython_tips [2021/06/24 16:03] (current) pwirving |
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| print(A) #This will then print out the number 21 | print(A) #This will then print out the number 21 | ||
| </code> | </code> | ||
| - | * **Dot Product** - the dot product is a way to [[184_notes:math_review#Vector Multiplication|multiply two vectors]]. Python has this command already programmed in: | + | * **Dot Product** - the dot product is a way to [[http://p3server.pa.msu.edu/coursewiki/doku.php?id=184_notes:math_review#Vector Multiplication|multiply two vectors]]. Python has this command already programmed in: |
| <code> | <code> | ||
| A=vec(1,2,3) | A=vec(1,2,3) | ||
| Line 62: | Line 62: | ||
| CD=cross(C,D) #This will calculate (6*1-2*7)i-hat - (5*1-7*2)j-hat + (5*2-6*3)k-hat | CD=cross(C,D) #This will calculate (6*1-2*7)i-hat - (5*1-7*2)j-hat + (5*2-6*3)k-hat | ||
| print(CD) #This will print out the vector (-8, 9, -8) | print(CD) #This will print out the vector (-8, 9, -8) | ||
| + | </code> | ||
| + | |||
| + | |||
| + | * **Graphing** - One method of graphing involves using physutil, which is a library that needs to be imported. From there, the syntax is similar to gcurve. MUST use GlowScript 2.9 or lower; anything higher will not import properly. | ||
| + | <code> | ||
| + | get_library('https://cdn.rawgit.com/PERLMSU/physutil/master/js/physutil.js') #Imports physutil | ||
| + | |||
| + | MassOfBall = 20 | ||
| + | SpeedOfBall = 10 | ||
| + | |||
| + | t=0 | ||
| + | dt=0.1 | ||
| + | tf=10 | ||
| + | |||
| + | ExampleGraph2 = PhysGraph(numPlots = 1) #Defines graph window | ||
| + | |||
| + | while t < tf: | ||
| + | rate(50) | ||
| + | | ||
| + | KineticEnergy = 0.5*MassOfBall*SpeedOfBall**2 | ||
| + | ExampleGraph2.plot(t, KineticEnergy) #Plot function is identical | ||
| + | SpeedOfBall = SpeedOfBall - 0.5 | ||
| + | | ||
| + | t = t+ dt | ||
| + | </code> | ||
| + | * **MotionMaps** - MotionMaps track an object and plant arrows in a trail behind the object. The size and direction of the arrows is controllable, so it can be a useful method to demonstrate any vector quantity of an object, such as velocity or Force. MUST use GlowScript 2.9 or lower; anything higher will not import properly. | ||
| + | <code> | ||
| + | get_library('https://cdn.rawgit.com/PERLMSU/physutil/master/js/physutil.js') #Imports physutil | ||
| + | |||
| + | Moving_Sphere = sphere(pos=vector(0,0,0), radius = 0.5, color = color.cyan) #The object we want to place arrows for, a cyan sphere. | ||
| + | Sphere_velocity = vector(5,5,0) #Let's say we want a MotionMap for the velocity of this sphere. | ||
| + | |||
| + | Setting up time parameters for the motion | ||
| + | t=0 | ||
| + | dt=0.1 | ||
| + | tf=10 | ||
| + | |||
| + | #Creating the MotionMap via MotionMap(object, stop time, number of arrows, arrow size, arrow color, number labels on arrows or not) | ||
| + | Moving_Sphere_MotionMap = MotionMap(Moving_Sphere, tf, 5, markerScale=1, markerColor=color.orange, labelMarkerOrder=False) | ||
| + | |||
| + | while t < tf: | ||
| + | rate(100) | ||
| + | | ||
| + | Moving_Sphere.pos = Moving_Sphere.pos + Sphere_velocity * dt #Sphere is moving according to its velocity | ||
| + | Moving_Sphere_MotionMap.update(t,Sphere_velocity) #MotionMap update function plots the vector as time goes by | ||
| + | | ||
| + | t = t + dt | ||
| </code> | </code> | ||