Matplotlib实时数据动画耗尽内存

Question

我使用一个Raspberry Pi来绘制串行的实时数据，但是最终内存耗尽了。我不确定是否/如何关闭这个数字，但仍然有一个实时的数据显示。

是否有可能用每一个动画创建和关闭一个新的人物？

我现在的代码是：

import serial
import matplotlib
# Force matplotlib to not use any Xwindows backend.
matplotlib.use('TkAgg') #comment out for debugging
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
import gc

# Create figure for plotting
fig = plt.figure()

xs = []
ysAC = []
ysDC = []

ser = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)
ser.flush()

# This function is called periodically from FuncAnimation
def animate(i, xs, ysAC, ysDC):

  values = getValues()

  wAC = values[1]
  wDC = values[2]
 
  # Add x and y to lists
  xs.append(i)
  ysAC.append(wAC)
  ysDC.append(wDC)

  # Limit x and y lists to 10 items
  xs = ['T-9','T-8','T-7','T-6','T-5','T-4','T-3','T-2','T-1','Now'] 
  ysDC = ysDC[-10:]
  ysAC = ysAC[-10:]

  # Draw x and y lists
  axRT1.clear()   
    
  if len(ysDC) == 10:
    lineAC, = axRT1.plot(xs, ysAC, 'b:', label='Mains', linewidth = 4)
    lineDC, = axRT1.plot(xs, ysDC, 'g--', label='Solar', linewidth = 4)
    
  gc.collect()
  #fig.clf()
  #plt.close()

def getValues():
  
  if ser.in_waiting > 0:
    line = ser.readline().decode('utf-8').rstrip()   
    return list(line.split(","))  

# Set up plot to call animate() function periodically
ani = animation.FuncAnimation(fig, animate, fargs=(xs, ysAC, ysDC), interval=1000, blit=False)
plt.get_current_fig_manager().full_screen_toggle()
plt.ioff()
plt.show()
plt.draw()

Answer 1

清除下面标出的地块的粗劣方法为我解决了这个问题：

import time
import serial
import datetime as dt
import matplotlib
# Force matplotlib to not use any Xwindows backend.
matplotlib.use('TkAgg') #comment out for debugging
import matplotlib.pyplot as plt
import matplotlib.cbook as cbook
import matplotlib.animation as animation
from decimal import Decimal
import pandas as pd
import numpy as np
import os.path as path
import re
import gc
import os

count = 0

# Create figure for plotting
fig = plt.figure()
fig.patch.set_facecolor('whitesmoke')
hFont = {'fontname':'sans-serif', 'weight':'bold', 'size':'12'}

xs = ['T-9','T-8','T-7','T-6','T-5','T-4','T-3','T-2','T-1','Now'] 
ysTemp = []
ysAC = []
ysDC = []

axRT1 = fig.add_subplot(2, 2, 1)
axRT2 = axRT1.twinx()  # instantiate a second axes that shares the same x-axis
#Draw x and y lists
axRT1.clear()   
axRT2.clear()
axRT1.set_ylim([0, 4])
axRT2.set_ylim([10, 70])

axRT1.set_ylabel('Power Consumption kW', **hFont)
axRT2.set_ylabel('Temperature C', **hFont)
axRT1.set_xlabel('Seconds', **hFont)
axRT1.set_title('Power Consumption and Temperature - Real Time', **hFont)
lineTemp, = axRT2.plot([], [], 'r', label='Temp', linewidth = 4)
lineAC, = axRT1.plot([], [], 'b:', label='Mains', linewidth = 4)
lineDC, = axRT1.plot([], [], 'g--', label='Solar', linewidth = 4)
fig.legend([lineAC, lineDC,lineTemp], ['Mains', 'Solar', 'Temp'], fontsize=20)

ser = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)
ser.flush()

# This function is called periodically from FuncAnimation
def animate(i, xs, ysTemp, ysAC, ysDC):

  values = getValues()

  if values != 0:
    temp_c = Decimal(re.search(r'\d+',values[3]).group())
    if temp_c < 0: temp_c = 0
    wAC = round(Decimal(re.search(r'\d+', values[1]).group())/1000, 2)
    if wAC < 0.35: wAC = 0
    aDC = float(re.search(r'\d+', values[2]).group()) #remove characters
    vDC = float(re.search(r'\d+', values[4][:5]).group()) #remove characters
    wDC = aDC * vDC
    wDC = round(abs(Decimal(wDC))/1000, 2)


    # Add x and y to lists
    ysTemp.append(temp_c)
    ysAC.append(wAC)
    ysDC.append(wDC)

    # Limit x and y lists to 10 items
    ysTemp = ysTemp[-10:]
    ysDC = ysDC[-10:]
    ysAC = ysAC[-10:]

    if len(ysTemp) == 10:
      axRT2.lines = [] #This crude way of clearing the plots worked
      axRT1.lines =[] #This crude way of clearing the plots worked
      lineTemp, = axRT2.plot(xs, ysTemp, 'r', label='Temp', linewidth = 4)
      lineAC, = axRT1.plot(xs, ysAC, 'b:', label='Mains', linewidth = 4)
      lineDC, = axRT1.plot(xs, ysDC, 'g--', label='Solar', linewidth = 4)



def getValues():

  measureList = 0

  if ser.in_waiting > 0:
    line = ser.readline().decode('utf-8').rstrip()
    print(line)

    if line.count(',') == 4:
      measureList = list(line.split(","))  

  return measureList

# Set up plot to call animate() function periodically
ani = animation.FuncAnimation(fig, animate, fargs=(xs, ysTemp, ysAC, ysDC), interval=1000, blit=False)
plt.get_current_fig_manager().full_screen_toggle()
plt.ioff()
plt.show()
plt.draw()