Writing numerical values on the plot with Matplotlib

Question

Is it possible  with Matplotlib  to print the values of each point on the graph   For example  if I have   x   numpy range 0 10  y   numpy array  5 3 4 2 7 5 4 6 3 2   pyplot plot x y    How can I display y values on the plot  e g  print a 5 near the  0 5  point  print a 3 near the  1 3  point  etc

User · Accepted Answer

You can use the annotate command to place text annotations at any x and y values you want. To place them exactly at the data points you could do this

import numpy
from matplotlib import pyplot

x = numpy.arange(10)
y = numpy.array([5,3,4,2,7,5,4,6,3,2])

fig = pyplot.figure()
ax = fig.add_subplot(111)
ax.set_ylim(0,10)
pyplot.plot(x,y)
for i,j in zip(x,y):
    ax.annotate(str(j),xy=(i,j))

pyplot.show()

If you want the annotations offset a little, you could change the annotate line to something like

ax.annotate(str(j),xy=(i,j+0.5))

User · Answer

Use pyplot text    import matplotlib pyplot as plt  import matplotlib pyplot as plt  x  1 2 3  y  9 8 7   plt plot x y  for a b in zip x  y        plt text a  b  str b   plt show

[python] Writing numerical values on the plot with Matplotlib

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