Show the values in the grid using matplotlib

by

Sure, just do something like:

import matplotlib.pyplot as plt
import numpy as np

data = np.random.random((4, 4))

fig, ax = plt.subplots()
# Using matshow here just because it sets the ticks up nicely. imshow is faster.
ax.matshow(data, cmap='seismic')

for (i, j), z in np.ndenumerate(data):
    ax.text(j, i, '{:0.1f}'.format(z), ha="center", va="center")

plt.show()

enter image description here

However, the labels are hard to see, so you might want a box around them:

import matplotlib.pyplot as plt
import numpy as np

data = np.random.random((4, 4))

fig, ax = plt.subplots()
# Using matshow here just because it sets the ticks up nicely. imshow is faster.
ax.matshow(data, cmap='seismic')

for (i, j), z in np.ndenumerate(data):
    ax.text(j, i, '{:0.1f}'.format(z), ha="center", va="center",
            bbox=dict(boxstyle="round", facecolor="white", edgecolor="0.3"))

plt.show()

enter image description here

Also, in many cases, ax.annotate is more useful that ax.text. It’s much more flexible in how you can position text, but it’s also more complex. Have a look at the examples here: http://matplotlib.org/users/annotations_guide.html

More Related Contents:

  1. Plotting dates on the x-axis with Python’s matplotlib
  2. Reverse Y-Axis in PyPlot
  3. Defining the midpoint of a colormap in matplotlib
  4. How do I fit a sine curve to my data with pylab and numpy?
  5. creating over 20 unique legend colors using matplotlib
  6. Using Colormaps to set color of line in matplotlib
  7. How to plot one line in different colors
  8. Python – Legend overlaps with the pie chart
  9. warning about too many open figures
  10. Add alpha to an existing matplotlib colormap
  11. Sans-serif math with latex in matplotlib
  12. tight_layout() doesn’t take into account figure suptitle
  13. How to remove or hide x-axis labels from a seaborn / matplotlib plot
  14. python matplotlib blit to axes or sides of the figure?
  15. Colorbar for matplotlib plot_surface command
  16. plot decision boundary matplotlib
  17. Large Dataset Polynomial Fitting Using Numpy
  18. When I use matplotlib in jupyter notebook,it always raise ” matplotlib is currently using a non-GUI backend” error?
  19. How to add a string as the artist in matplotlib legend?
  20. Plot a bar plot from a Pandas DataFrame
  21. Python scatter plot. Size and style of the marker
  22. Python Scatter Plot with Multiple Y values for each X
  23. How to skip empty dates (weekends) in a financial Matplotlib Python graph?
  24. Matplotlib: How to colorize a large number of line segments as independent gradients, efficiently
  25. How to create major and minor gridlines with different linestyles in Python
  26. ValueError: Unknown projection ‘3d’
  27. Elegantly changing the color of a plot frame in matplotlib
  28. How to have actual values in matplotlib Pie Chart displayed
  29. Is it possible to add hatches to each individual bar in seaborn.barplot?
  30. matplotlib taking time when being imported

Leave a Comment