create heatmap2d from txt file

by

If you’re willing to do everything in Python, you can compute the histogram and build a contour plot in one script :

import numpy as np
import matplotlib.pyplot as plt

# load the data
M = np.loadtxt('datafile.dat', skiprows=1)

# compute 2d histogram
bins_x = 100
bins_y = 100
H, xedges, yedges = np.histogram2d(M[:,0], M[:,1], [bins_x, bins_y])

# xedges and yedges are each length 101 -- here we average
# the left and right edges of each bin
X, Y = np.meshgrid((xedges[1:] + xedges[:-1]) / 2,
                   (yedges[1:] + yedges[:-1]) / 2)

# make the plot, using a "jet" colormap for colors
plt.contourf(X, Y, H, cmap='jet')

plt.show()  # or plt.savefig('contours.pdf')

I just made up some test data composed of 2 Gaussians and got this result :

contour plot from 2d histogram

More Related Contents:

  1. Plot two histograms on single chart with matplotlib
  2. gnuplot linecolor variable in matplotlib?
  3. Histogram in matplotlib, time on x-Axis
  4. Annotate bars with values on Pandas bar plots
  5. Matplotlib y axis values are not ordered [duplicate]
  6. Adding a legend to PyPlot in Matplotlib in the simplest manner possible
  7. What is the difference between pylab and pyplot? [duplicate]
  8. Why do many examples use `fig, ax = plt.subplots()` in Matplotlib/pyplot/python
  9. How to set xlim and ylim for a subplot in matplotlib [duplicate]
  10. Paging/scrolling through set of 2D heat maps in matplotlib
  11. Axes class – set explicitly size (width/height) of axes in given units
  12. Modify the legend of pandas bar plot
  13. Changing plot scale by a factor in matplotlib
  14. Plot curve with blending line colors with matplotlib/pyplot
  15. Specifying the order of matplotlib layers
  16. Increase the speed of redrawing contour plot in matplotlib
  17. Changing the tick frequency on the x or y axis
  18. How do I align gridlines for two y-axis scales using Matplotlib?
  19. How to remove lines in a Matplotlib plot
  20. pandas bar plot combined with line plot shows the time axis beginning at 1970
  21. How to plot time series in python
  22. How do I plot list of tuples in Python?
  23. making matplotlib scatter plots from dataframes in Python’s pandas
  24. How to center labels in histogram plot
  25. Move spines in matplotlib 3d plot?
  26. Matplotlib autoscale
  27. How to remove/omit smaller contour lines using matplotlib
  28. 3D Plots over non-rectangular domain
  29. How do I align gridlines for two y-axis scales?
  30. Specifying the order of layers

Leave a Comment