How to Multiply histograms

This example shows how to multiply 2 histograms. To show the effect of multiplying 2 histograms we use matplotlib to create a 2 by 2 grid to display multiple plots on the same window. The histograms are plotted using the plotting module mpl from this package (which internally uses matplotlib).

import random
import matplotlib.pyplot as plt

from qksplot.hist import Hist1D
from qksplot import mpl

# create histograms
h1 = Hist1D(10, -1, 1, title="H1")
h2 = Hist1D(10, -1, 1, title="H2")

# fill the histogram
for x in range(100):
    # generate random numbers to fill the hists
    r1 = random.uniform(-1, 1)
    r2 = random.uniform(-1, 1)

    h1.fill(r1)
    h2.fill(r2)

# substract the histograms, store the result in a third hist
h3 = h1 * h2
h3.title = "H1 * H2"

# create a grid where to rest the plots
grid = plt.GridSpec(2, 2, wspace=0.2, hspace=0.4)

# plot h1
plt.subplot(grid[0, 0])
mpl.plot_hist(h1)

# plot h2
plt.subplot(grid[0, 1])
mpl.plot_hist(h2)

# plot h3
plt.subplot(grid[1, 0:])
mpl.plot_hist(h3)

mpl.show()