A logarithmic colorbar in matplotlib scatter plot

by

There is now a section of the documentation describing how color mapping and normalization works

The way that matplotlib does color mapping is in two steps, first a Normalize function (wrapped up by the sub-classes of matplotlib.colors.Normalize) which maps the data you hand in to [0, 1]. The second step maps values in [0,1] -> RGBA space.

You just need to use the LogNorm normalization class, passed in with the norm kwarg.

plt.scatter(x,y,edgecolors="none",s=marker_size,c=void_fraction,
                norm=matplotlib.colors.LogNorm())

When you want to scale/tweak data for plotting, it is better to let matplotlib do the transformations than to do it your self.

  • Normalize doc
  • LogNorm doc
  • matplotlib.color doc

More Related Contents:

  1. Why we use plt in general not the name of the object? [closed]
  2. What is the difference between drawing plots using plot, axes or figure in matplotlib?
  3. Matplotlib: Specify format of floats for tick labels
  4. Matplotlib y axis values are not ordered [duplicate]
  5. Adding a legend to PyPlot in Matplotlib in the simplest manner possible
  6. pyplot common axes labels for subplots
  7. how to get ticks every hour?
  8. How to add value labels on a bar chart
  9. Plot two histograms on single chart with matplotlib
  10. How to plot normal distribution
  11. Scatter plot form dataframe with index on x-axis
  12. Delete a subplot
  13. How to plot stacked event duration (Gantt Charts)
  14. Matplotlib: how to make imshow read x,y coordinates from other numpy arrays?
  15. How to show a bar and line graph on the same plot
  16. How to change outliers to some other colors in a scatter plot
  17. How to write your own LaTeX preamble in Matplotlib?
  18. “UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.” when plotting figure with pyplot on Pycharm
  19. Multivariate (polynomial) best fit curve in python?
  20. matplotlib: how to draw a rectangle on image
  21. How do I align gridlines for two y-axis scales using Matplotlib?
  22. Matplotlib cannot find basic fonts
  23. How to plot time series in python
  24. how to save a pylab figure into in-memory file which can be read into PIL image?
  25. Broken axis example: uneven subplot size
  26. Unable to “import matplotlib.pyplot as plt” in virtualenv
  27. pylab.hist(data, normed=1). Normalization seems to work incorrect
  28. Move spines in matplotlib 3d plot?
  29. Setting Different error bar colors in bar plot in matplotlib
  30. Matplotlib – Wrong overlapping when plotting two 3D surfaces on the same axes

Leave a Comment