Bottom Page

• 0 Vote(s) - 0 Average
• 1
• 2
• 3
• 4
• 5
 Animation using matplotlib query JohnDoe Unladen Swallow Posts: 1 Threads: 1 Joined: May 2019 Reputation: 0 Likes received: 0 #1 May-09-2019, 08:07 PM I am trying to animate a plot of two distinct points (blue and orange points) moving about the complex unit circle using Python's Matplotlib library (the type of animation shown here but for only two points on the circle). The problem I am having is that the animation does not remove and update the previous data points but rather sequentially smears it on the unit sphere. Hence the animation is just a sequential smudging of the various data points rather than two distinct points orbiting. I am having difficulty updating the animation to achieve this. The following is the code where I call 'animation.FuncAnimation' to animate data stored in arrays called 'Aan' and 'Ban'. ```##Python Code for Executing Animation## import matplotlib.animation as animation import matplotlib.pyplot as plt import numpy as np from pylab import * #Example Data A = array([0., 0.03435915, 0.06328989, 0.0880305, 0.14199928, 0.2044361, 0.26287941, 0.32484623]) B = array([ 1.75, 1.71564086, 1.69358362, 1.68499179, 1.68255084, 1.67808712, 1.66169597, 1.64407287]) # Total time. T = 1.0 # Number of steps. NS = 100 # Time step size dt = T/NS t = np.linspace(0.0, NS*dt, NS+1) # So here are a few utility functions for multiplying scalars and vectors. # a scalar times a vector returns a vector def scale_vector(scale, vector): result = *len(vector) for i in range(len(result)): result[i] = scale * vector[i] return result # dot product of two vectors = sum(x*y + ... + x[n-1]*y[n-1]) def vector_dot(vector1, vector2): result = 0 for i in range(len(vector1)): result += vector1[i] * vector2[i] return result # return real part of a vector def real_vector(vector): return map(lambda x: x.real, vector) # return imaginary part of a vector def imag_vector(vector): return map(lambda x: x.imag, vector) ## Creating complex unit circle r = [] im = [] def main(): # Generate numbers around the complex unit circle. N = 128 theta = scale_vector(2*pi/N, range(N)) exp_theta = map(lambda x: exp(1j * x), theta) real_part = real_vector(exp_theta) imag_part = imag_vector(exp_theta) r.append(real_part) im.append(imag_part) # And wait until the user is done with it. done = raw_input("done? ") if __name__ == "__main__": main() #Form two arrays which have the real and imaginary components of the unit circle r2 = r[:] im2 = im[:] ##Code for Animation## Aan = np.zeros([len(A),2], float) for i in range(2): for j in range(len(A)): if i == 0: Aan[j][i] = math.cos(A[j]) elif i == 1: Aan[j][i] = math.sin(A[j]) Ban = np.zeros([len(B),2], float) for i in range(2): for j in range(len(B)): if i == 0: Ban[j][i] = math.cos(B[j]) elif i == 1: Ban[j][i] = math.sin(B[j]) ##Plots and animation fig = figure() plt.title('Phase Space') plt.xlabel('Re') plt.ylabel('Im') #Plots complex unit circle plot1 = plt.plot(r2,im2, color = 'g',alpha = 0.4) #Animation functions def animate(i): plot(Aan[i, 0], Aan[i, 1], color='blue', marker= 'o') plot(Ban[i, 0], Ban[i, 1], color='orange', marker= 'o') ani = animation.FuncAnimation(fig, animate, interval=101) show() ```Can anyone advise on how this code could be adapted to resolve this problem? Thanks. « Next Oldest | Next Newest »

Top Page

 Possibly Related Threads... Thread Author Replies Views Last Post How to continue code after .show() in matplotlib? jasper100125 1 102 Sep-09-2019, 02:44 AM Last Post: luoheng Matplotlib : linewidth parameters Zopost 0 253 Aug-16-2019, 07:07 PM Last Post: Zopost Camera animation to Text file (CINEMA 4D) vbz 0 116 Aug-13-2019, 07:39 AM Last Post: vbz hatching not working properly with matplotlib Staph 3 140 Jul-28-2019, 07:17 AM Last Post: ThomasL HX711&matplotlib problems olego 0 119 Jul-12-2019, 12:22 PM Last Post: olego SQL query with a variable amount of parameters Antares 10 515 Jul-08-2019, 02:24 PM Last Post: Antares Matplotlib problem ift38375 0 138 Jul-02-2019, 02:55 PM Last Post: ift38375 3D animation angel23 1 175 Jul-01-2019, 01:34 AM Last Post: micseydel Matplotlib contour no data coordinates b4rtt 1 264 Jun-18-2019, 09:36 AM Last Post: b4rtt Matplotlib ImportError robertinoc 4 359 Jun-14-2019, 09:11 AM Last Post: snippsat

Forum Jump:

Users browsing this thread: 1 Guest(s)