Getting proper x,y axis values

[deanhystad]

Why? Normally axis labels indicate range with maybe some subdivisions to give approximate value. If you want the real value you click on the plot.

You can tell matplotlib where to put tickmarks like this:

import numpy as np
import matplotlib.pyplot as plt
from math import sin

x = np.linspace(0.0, np.pi * 2, 100)
x1 = 1
y1 = sin(1)
x2 = 5
y2 = sin(5)

fig, ax = plt.subplots()
plt.plot(x, np.sin(x))
ax.set_xticks((x1, x2))
ax.set_yticks((y1, y2))
ax.grid(True)
plt.show()