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python-matplotlibHow to plot heatmap with values


import matplotlib.pyplot as plt

data = [[0.8, 2.4, 2.5], [1.3, 1.2, 0.0], [0.1, 2.0, 0.0]]
fig, ax = plt.subplots()
im = ax.imshow(data)

for i in range(len(data)):
  for j in range(len(data[0])):
    text = ax.text(j, i, data[i][j])

plt.show()ctrl + c
import matplotlib.pyplot as plt

loads Matplotlib module to use plotting capabilities

.subplots(

creates set of charts on a single chart area

.imshow(

displays data as an image (used for heatmaps from 2d arrays)

for i in range(len(data))

iterate through data rows

for j in range(len(data[0]))

iterate through data columns

.text(

adds custom text to chart

j, i, data[i][j]

add data value as a text object using corresponding coordinates

.show()

render chart in a separate window


How to plot heatmap with values, python matplotlib

Usage example

import matplotlib.pyplot as plt

data = [[0.8, 2.4, 2.5], [1.3, 1.2, 0.0], [0.1, 2.0, 0.0]]
fig, ax = plt.subplots()
im = ax.imshow(data)

for i in range(len(data)):
  for j in range(len(data[0])):
    text = ax.text(j, i, data[i][j])

plt.show()