Help in plotting histogram

[Ronald Ng]

Dear All, 

I need help in plotting histogram from two variables. 

My turtles have two "turtles own"  variables. They are both numeric variables, AAA and BBB. 

How does one write the codes for plotting BBB against AAA?

Thanks,

Ronald Ng

[Wade Schuette]

One way to do that kind of "scatterplot" ( not "histogram") is to use Python's MatPlotLib which gives you complete

control over color, size,shape, alpha, of the plot.  Of course you have to have python installed and you need to

point your pathway to the python executable, once,  as described in the NetLogo Documentation.

Documentation on scatterplot in MatPlotLib

https://matplotlib.org/stable/gallery/shapes_and_collections/scatter.html#sphx-glr-gallery-shapes-and-collections-scatter-py

If you do that, the following Netlogo code below will produce this if you run setup, then "testplot"

and this if you run setup then "scatterplot" which reads the AAA and BBB values from turtles

and plots it.

Here's the total Netlogo code that runs correctly for me. I think you need

Netlogo 6.3, as 6.2x had some issue with python.

;;============= Netlogo 6.3 code =======

extensions [py]
turtles-own [ AAA BBB ]
to setup
  clear-all
  create-turtles 10 [ set AAA who set BBB (who ^ 1.3) ]
  reset-ticks
end
to  scatterplot
  print "Setting up python now"
  py:setup py:python
  let xlist [ ]
  let ylist [ ]
  ask turtles [ set xlist lput AAA xlist   set ylist lput precision BBB 3 ylist]
  print xlist
  print ylist
  py:set "x" xlist
  py:set "y" ylist
  carefully [
  (py:run
  "import matplotlib"
  "matplotlib.use('TkAgg')"
  "import numpy as np"
  "import matplotlib.pyplot as plt"
  "plt.scatter(x, y )"
  "plt.show()"
)
  ] [ print "ran into some problem running python." ]
 py:run "print('python finished')"
 print "End of plot routine"
end
to  testplot
   print "Setting up python now"
  py:setup py:python
  show py:runresult "1 + 1"
  carefully [
  (py:run
  "import matplotlib"
  "matplotlib.use('TkAgg')"
  "import numpy as np"
  "import matplotlib.pyplot as plt"
  "N = 50"
  "x = np.random.rand(N)"
  "y = np.random.rand(N)"
  "colors = np.random.rand(N)"
  "area = (30 * np.random.rand(N))**2  "
  "plt.scatter(x, y, s=area, c=colors, alpha=0.5)"
  "plt.show()"
)
  ] [ print "ran into some problem running python." ]
 py:run "print('python finished')"
 print "End of plot routine"
end

;;====================

Wade

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