How to create a matplotlib bar chart with a threshold line?

Question

I\'d like to know how to create a matplotlib bar chart with a threshold line, the part of bars above threshold line should have red color, and the parts below the threshold line

Answer 1

Make it a stacked bar chart, like in this example, but divide your data up into the parts above your threshold and the parts below. Example:

import numpy as np
import matplotlib.pyplot as plt

# some example data
threshold = 43.0
values = np.array([30., 87.3, 99.9, 3.33, 50.0])
x = range(len(values))

# split it up
above_threshold = np.maximum(values - threshold, 0)
below_threshold = np.minimum(values, threshold)

# and plot it
fig, ax = plt.subplots()
ax.bar(x, below_threshold, 0.35, color="g")
ax.bar(x, above_threshold, 0.35, color="r",
        bottom=below_threshold)

# horizontal line indicating the threshold
ax.plot([0., 4.5], [threshold, threshold], "k--")

fig.savefig("look-ma_a-threshold-plot.png")