matplotlib Help using python 2.7 - python-2.7

Question

Hi I am trying to make a scatter plot and annotate data points with real value of each point
but just the yLabel value
it mean take real value of the point and plot it near to the point
python code
import serial # import Serial Library
import time #import time
import numpy # Import numpy
import matplotlib.pyplot as plt #import matplotlib library
from drawnow import *
temperature= []
vitesse= []
charge= []
current= []
arduinoData = serial.Serial('com5', 9600) #Creating our serial object named arduinoData
plt.ion() #Tell matplotlib you want interactive mode to plot live data
cnt=0
def makeFig(): #Create a function that makes our desired plot
plt.subplot(2,2,1)
plt.title('Live Streaming Temperature Sensor Data')
plt.ylabel('Temperature C')
plt.grid(True)
plt.plot(temperature, 'ro-')
plt.subplot(2,2,2)
plt.title('Live Streaming Speed Sensor Data')
plt.ylabel('Speed KM/H')
plt.grid(True)
plt.plot(vitesse, 'bo-')
plt.subplot(2,2,3)
plt.title('Live Streaming SOC Sensor Data')
plt.ylabel('Battery Charge %')
plt.grid(True)
plt.plot(charge, 'go-')
plt.subplot(2,2,4)
plt.title('Live Streaming Current Sensor Data')
plt.ylabel('Current A')
plt.grid(True)
plt.plot(current, 'yo-')
while True: # While loop that loops forever
while (arduinoData.inWaiting()==0): #Wait here until there is data
pass #do nothing
arduinoString = arduinoData.readline() #read the line of text from the serial port
dataArray = arduinoString.split(';') #Split it into an array called dataArray
temp = float (dataArray[0])
vite = float (dataArray[1])
char = float (dataArray[2])
curr = float (dataArray[3])
temperature.append(temp) #Build our temperature array by appending temp readings
vitesse.append(vite) #Build our vitesse array by appending temp readings
charge.append(char) #Build our charge array by appending temp readings
current.append(curr) #Build our current array by appending temp readings
drawnow(makeFig) #Call drawnow to update our live graph
plt.pause(0.00001)
cnt=cnt+1
if(cnt>50):
temperature.pop(0)
vitesse.pop(0)
charge.pop(0)
current.pop(0)
any ideas ?????

Answer 1

use the annotate() function to create labels attached to specific points in your plot.
see http://matplotlib.org/users/annotations_intro.html
and http://matplotlib.org/examples/pylab_examples/annotation_demo2.html

Answer 2

If I understood what you were looking for, you should use plt.ticklabel_format(useOffset=False) at the end of every subplot. So that, you are going to fix the y scale. Use plt.ylim(m,n) to set the limits of the y axe, where "m" is the beggining of the axe and "n" is the end.