Python:更新情节而不是创建新情节

Python: Update plot instead of creating a new one

我正在尝试使用 Python 对伊辛模型进行编码。

我想,我已经正确编码了,但我对动画或绘图有问题。我似乎为每个配置绘制了一个新图像,而不是更新现有的图像,导致我不需要很多已保存的图像。如果可能的话,我只想要一个正在更新的情节。

我知道,我在循环内绘图,但我不记得这是一个问题,当我想绘制每个迭代时。会不会是Seaborn的热图有问题?

我附上了我的代码:

import numpy as np
import numpy.random as npr
import matplotlib.pyplot as plt
import seaborn as sns

#Constants
J = 1
h = 1
kbT = 1
beta = 1

#Grid
L = 20 #Dimensions
N = L**2 #Total number of grid points


#Initial configuration
spins = 2*np.random.randint(2, size = (L,L))-1


E = []
i = 0
plt.figure()

while i < 100000:
    for i in range(1,N):
        i += 1
        s = tuple(npr.randint(0, L, 2)) # Random initial coordinate
    
        # x and y coordinate
        (sx, sy) = s
        # Periodic boundary condition
        sl = (sx-1, sy) 
        sr = ((sx+1)%L, sy)
        sb = (sx, sy-1)
        st = (sx, (sy+1)%L)
        # Energy
        E =   spins[s] * ( spins[sl] + spins[sr] + spins[sb] + spins[st] )
        if E <= 0 : # If negative, flip
            spins[s] *= -1
        else:
            x = np.exp(-E/kbT) # If positve, check condition
            q = npr.rand()
            if x > q: 
                spins[s] *= -1
    # Plot (heatmap)
    sns.heatmap(spins, cmap = 'magma')
    plt.pause(10e-10)
    plt.draw()
    plt.show()

我认为函数 ionclf 可以解决问题。

import numpy as np
import numpy.random as npr
import matplotlib.pyplot as plt
import seaborn as sns

#Constants
J = 1
h = 1
kbT = 1
beta = 1

#Grid
L = 20 #Dimensions
N = L**2 #Total number of grid points

#Initial configuration
spins = 2*np.random.randint(2, size = (L,L))-1

E = []
i = 0

plt.ion()
plt.figure()
plt.show()

while i < 100000:
    for i in range(1,N):
        i += 1
        s = tuple(npr.randint(0, L, 2)) # Random initial coordinate
    
        # x and y coordinate
        (sx, sy) = s
        # Periodic boundary condition
        sl = (sx-1, sy) 
        sr = ((sx+1)%L, sy)
        sb = (sx, sy-1)
        st = (sx, (sy+1)%L)
        # Energy
        E =   spins[s] * ( spins[sl] + spins[sr] + spins[sb] + spins[st] )
        if E <= 0 : # If negative, flip
            spins[s] *= -1
        else:
            x = np.exp(-E/kbT) # If positve, check condition
            q = npr.rand()
            if x > q: 
                spins[s] *= -1
    # Plot (heatmap)
    plt.clf()
    sns.heatmap(spins, cmap = 'magma')
    plt.pause(10e-10)

使用函数 ion,您正在制作交互式情节,因此您需要:

  • 使其具有交互性
  • 显示剧情
  • 清除循环中的剧情

Here ion 函数的参考。

clf 的引用是 here