How to do a scatter plot with empty circles in Python

Question

In Python  with Matplotlib  how can a scatter plot with empty circles be plotted   The goal is to draw empty circles around some of the colored disks already plotted by scatter    so as to highlight them  ideally without having to redraw the colored circles   I tried facecolors None  to no avail

User · Accepted Answer

From the documentation for scatter   Optional kwargs control the Collection properties  in particular       edgecolors          The string    none    to plot faces with no outlines     facecolors          The string    none    to plot unfilled outlines   Try the following   import matplotlib pyplot as plt  import numpy as np   x   np random randn 60   y   np random randn 60   plt scatter x  y  s 80  facecolors  none   edgecolors  r   plt show       Note  For other types of plots see this post on the use of markeredgecolor and markerfacecolor

User · Answer

In matplotlib 2 0 there is a parameter called fillstyle which allows better control on the way markers are filled   In my case I have used it with errorbars but it works for markers in general http   matplotlib org api  as gen matplotlib axes Axes errorbar html  fillstyle accepts the following values      full         left         right         bottom         top         none      There are two important things to keep in mind when using fillstyle   1  If mfc is set to any kind of value it will take priority  hence  if you did set fillstyle to  none  it would not take effect  So avoid using mfc in conjuntion with fillstyle  2  You might want to control the marker edge width  using markeredgewidth or mew  because if the marker is relatively small and the edge width is thick  the markers will look like filled even though they are not   Following is an example using errorbars   myplot errorbar x myXval  y myYval  yerr myYerrVal  fmt  o   fillstyle  none   ecolor  blue    mec  blue

User · Answer

Would these work   plt scatter np random randn 100   np random randn 100   facecolors  none       or using plot    plt plot np random randn 100   np random randn 100    o   mfc  none

User · Answer

Here s another way  this adds a circle to the current axes  plot or image or whatever     from matplotlib patches import Circle     matplotlib patches py  def circle  xy  radius  color  lightsteelblue   facecolor  none   alpha 1  ax None            add a circle to ax  or current axes                   from     pylab examples ellipse demo py     e   Circle  xy xy  radius radius       if ax is None          ax   pl gca      ax   subplot  1 1 1       ax add artist e      e set clip box ax bbox      e set edgecolor  color       e set facecolor  facecolor       none  not None     e set alpha  alpha        The circles in the picture get squashed to ellipses because imshow aspect  auto

User · Answer

So I assume you want to highlight some points that fit a certain criteria  You can use Prelude s command to do a second scatter plot of the hightlighted points with an empty circle and a first call to plot all the points  Make sure the s paramter is sufficiently small for the larger empty circles to enclose the smaller filled ones   The other option is to not use scatter and draw the patches individually using the circle ellipse command  These are in matplotlib patches  here is some sample code on how to draw circles rectangles etc

User · Answer

Basend on the example of Gary Kerr and as proposed here one may create empty circles related to specified values with following code   import matplotlib pyplot as plt  import numpy as np  from matplotlib markers import MarkerStyle  x   np random randn 60   y   np random randn 60  z   np random randn 60   g plt scatter x  y  s 80  c z  g set facecolor  none   plt colorbar   plt show

[python] How to do a scatter plot with empty circles in Python?

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