How can I slow down the plotting speed?

Question

horizon 2019-5-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/459540-how-can-i-slow-down-the-plotting-speed

评论： Walter Roberson 2019-5-4

采纳的回答： KSSV

在 MATLAB Online 中打开

I would like to change the plotting speed of the following code.

I've tried to edit the TimeStamps part like these

  subplot(2,1,1)
  plot(t1/100,s1)
  ylim([-10.0 10.0]);
  title('s_1')
  
  subplot(2,1,2)
  plot(t1/100,s2)
  ylim([-10.0 10.0]);
  title('s_2')
  xlabel('Time (s)')

but the plotting speed was not changed.

Entire Code

tx = daq.createSession('ni');
s = daq.createSession('ni');
s.Rate = 400000;
ultraFreq = 40000;
numCycle =8
addAnalogOutputChannel(tx, 'Dev1', 'ao0', 'Voltage');
th=addlistener(tx, 'DataRequired', @queueMoreData);
addAnalogInputChannel(s,'Dev1', 'ai0', 'Voltage'); 
ch = addAnalogInputChannel(s, 'Dev1', 'ai1', 'Voltage'); 
h = addlistener(s, 'DataAvailable', @plotData); 
s.DurationInSeconds(1);
queueOutputData(tx, y');
startBackground(s);
tx.startForeground();
function plotData(src, event)
  t1 = event.TimeStamps(:,1);
  s1 = event.Data(:,1);
  s2 = event.Data(:,2);
  subplot(2,1,1)
  plot(t1,s1)
  ylim([-10.0 10.0]);
  title('s_1')
  
  subplot(2,1,2)
  plot(t1,s2)
  ylim([-10.0 10.0]);
  title('s_2')
  xlabel('Time (s)')
end
function queueMoreData(src, event)
  queueOutputData(tx, y');
end

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Answer 1

KSSV 2019-5-1

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/459540-how-can-i-slow-down-the-plotting-speed#answer_373076

Read about pause

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horizon 2019-5-4

在 MATLAB Online 中打开

I wrote the following code in Python and figured out 'interval' was the variable for the plotting speed in this case.

As you introduced me, I've read the MATLAB document for pause, but I am still troubled with the way to use it on MATLAB.

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import itertools
import math
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
def _update(frame, x, y):
    """function to update graph"""
    # clear the real time data
    plt.cla()
    # update and append the data
    x.append(frame)
    y.append(math.sin(frame))
    # rewrite graph
    plt.plot(x, y)
def main():
    # area to plot
    fig = plt.figure(figsize=(10, 6))
    # data to plot
    x = []
    y = []
    params = {
        'fig': fig,
        'func': _update,  # function to update graph
        'fargs': (x, y),  # arguments for the function
        'interval': 10,  # frequency to update (ms)
        'frames': itertools.count(0, 0.1),  # itertool to create infinite frames
    }
    anime = animation.FuncAnimation(**params)
    # plot graph
    plt.show()
if __name__ == '__main__':
    main()