Adding color to Polar Scatter plot data points

Question

I am trying to make a polar plot with Python, from which I have so far been somewhat successful.

scattered scatter plot example

I had a few questions for which I was hoping to get some ideas / suggestions:

• Is it possible to set the color of the circles to a specific value (for example, "n" in the code example below)? If so, can I specify specific color ranges? For example: 0-30: red, 31-40: yellow; 41-60: green

Note: following the examples from the plot with conditional colors based on values ​​in R , I tried ax.scatter(ra,dec,c = ifelse(n < 30,’red','green'), pch = 19 )without success = (

2. How to make data circles a little more?

3. "90" , ? : x.set_rlabel_position(-22.5), ( "AttributeError: " PolarAxes " " set_rlabel_position ")

4. 0,30 60 ? (: 0)?

! =)

import numpy
import matplotlib.pyplot as pyplot

dec = [10,20,30,40,50,60,70,80,90,80,70,60,50,40,30,20,10]
ra = [225,225,225,225,225,225,225,225,225,45,45,45,45,45,45,45,45]
n = [20,23,36,43,47,48,49,50,51,50,48,46,44,36,30,24,21]

ra = [x/180.0*3.141593 for x in ra]
fig = pyplot.figure()
ax = fig.add_axes([0.1,0.1,0.8,0.8],polar=True)
ax.set_ylim(0,90)
ax.set_yticks(numpy.arange(0,90,10))
ax.scatter(ra,dec,c ='r')
ax.set_title("Graph Title here", va='bottom')
pyplot.show()

Answer 1

1.
c scatter . n, . (31 , 10 , 20 ). , .

2. , s.

3. . , , y set_title. , subplots_adjust top . ( , , .)

4. , ax.set_yticks([0,30,60]) ax.set_rlabel_position(0). ( , set_rlabel_position 1.4, , ).

import numpy as np
import matplotlib.pyplot as plt # don't use pylab
import matplotlib.colors
import matplotlib.cm

dec = [10,20,30,40,50,60,70,80,90,80,70,60,50,40,30,20,10]
ra = [225,225,225,225,225,225,225,225,225,45,45,45,45,45,45,45,45]
n = [20,23,36,43,47,48,49,50,51,50,48,46,44,36,30,24,21]

ra = [x/180.0*np.pi for x in ra]
fig = plt.figure()
ax = fig.add_subplot(111,polar=True)
ax.set_ylim(0,90)

# 4. only show 0,30, 60 ticks
ax.set_yticks([0,30,60])
# 4. orient ylabels along horizontal line
ax.set_rlabel_position(0)

# 1. prepare cmap and norm
colors= ["red"] * 31 + ["gold"] * 10 + ["limegreen"] * 20
cmap=matplotlib.colors.ListedColormap(colors)
norm = matplotlib.colors.Normalize(vmin=0, vmax=60)   
# 2. make circles bigger, using `s` argument
# 1. set different colors according to `n`
sc = ax.scatter(ra,dec,c =n, s=49, cmap=cmap, norm=norm, zorder=2)

# 1. make colorbar
cax = fig.add_axes([0.8,0.1,0.01,0.2])
fig.colorbar(sc, cax=cax, label="n", ticks=[0,30,40,60])
# 3. move title upwards, then adjust top spacing
ax.set_title("Graph Title here", va='bottom', y=1.1)
plt.subplots_adjust(top=0.8)

plt.show()

Answer 2

c = [ ], s = :

ax.scatter(ra,dec,c =['r' if a < 31 else 'yellow' if a < 41 else 'green' for a in n], s =40)

:

ax.set_title("Graph Title here", va='bottom', y=1.08)

, :

fig = pyplot.figure(figsize=(7,8))

, :

for label in ax.yaxis.get_ticklabels():
    label.set_visible(False)
for label in ax.yaxis.get_ticklabels()[::3]:
    label.set_visible(True)

:

import numpy
import matplotlib.pyplot as pyplot

dec = [10,20,30,40,50,60,70,80,90,80,70,60,50,40,30,20,10]
ra = [225,225,225,225,225,225,225,225,225,45,45,45,45,45,45,45,45]
n = [20,23,36,43,47,48,49,50,51,50,48,46,44,36,30,24,21]

ra = [x/180.0*3.141593 for x in ra]
fig = pyplot.figure(figsize=(7,8))
ax = fig.add_axes([0.1,0.1,0.8,0.8],polar=True)
ax.set_ylim(0,90)
ax.set_yticks(numpy.arange(0,90,10))

ax.scatter(ra,dec,c =['r' if a < 31 else 'yellow' if a < 41 else 'green' for a in n], s =40)
ax.set_title("Graph Title here", va='bottom', y=1.08)
for label in ax.yaxis.get_ticklabels():
    label.set_visible(False)
for label in ax.yaxis.get_ticklabels()[::3]:
    label.set_visible(True)
pyplot.show()