# Setting tick colors on a Polar plot for a circumplex

Hi All.

I am trying to create a circumplex (or “rose”) plot that looks a bit like this:

http://www.organizacionakultura.net/slike_fck/image/Ideal%20culture%20profile%20ENG(1).jpg

At the moment I am using a Polar plot and trying to manipulate it so that it looks more like a circumplex (with each “slice of the cake” corresponding to a label).

I want to change the color of the ticklines set by set_thetagrids(), but I am not having any luck.

( See black instead of green ticklines here: http://i1234.photobucket.com/albums/ff405/dbathory/circum.png )

Should I be able manipulating the ticklines in this way after calling set_theagrids?

for line in ax.xaxis.get_ticklines():

line.set_color(‘g’)

I’ve also tried using the tick_params() call to set the default tickline color, with no luck.

I’ve tried this on matplotlib v1.00 and v98.1, with the same results (black instead of green).

Full code:

#============== START CODE =====================

#!/usr/bin/python

import numpy as np

import matplotlib

matplotlib.use(‘Agg’)

import matplotlib.pyplot as plt

from matplotlib.projections.polar import PolarAxes

import matplotlib.cm as cm

labels = [‘Label A’, ‘Label B’, ‘Label C’, ‘Label D’, ‘Label E’, ‘Label F’, ‘Label G’, ‘Label H’, ‘Label I’ ]

data = [ 7, 5, 3, 11, 4, 2, 9, 8, 5 ]

max_size = 12

N = len(data)

# This doesn’t seem to change the tick color

plt.tick_params(axis=‘both’, which=‘both’, color=‘g’)

fig = plt.figure(figsize=(8,8))

ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True)

theta = np.arange(0.0, 2np.pi, 2np.pi/N)

width = np.pi*2/N

bars = ax.bar(theta, radii, width=width, bottom=0.0)

bar.set_facecolor( cm.jet(r/10.))

bar.set_alpha(0.5)

spoke_angles = theta * 180/np.pi - 180/N

(g_lines, g_labels) = ax.set_thetagrids(spoke_angles, labels, color=‘r’)

for line in ax.xaxis.get_ticklines():

line.set_color(‘g’) # This doesn’t seem to change the tick color either

ax.set_rgrids([10000], ) # Just moving the rgrids out the way for now

fig.savefig(‘circum.png’)

#============== END CODE =====================

Damien Bathory, on 2011-01-11 15:27, wrote:

Hi All.
...
I want to change the color of the ticklines set by set_thetagrids(), but I
am not having any luck.
( See black instead of green ticklines here:
http://i1234.photobucket.com/albums/ff405/dbathory/circum.png )

Should I be able manipulating the ticklines in this way after calling
set_theagrids?

for line in ax.xaxis.get_ticklines():
line.set_color('g')

I've also tried using the tick_params() call to set the default tickline
color, with no luck.
I've tried this on matplotlib v1.00 and v98.1, with the same results (black

Hi Damien,

Those aren't ticks, those are grid lines (verify by pressing 'g'
after selecting the axes to toggle the grid on and off).

ax.grid(color='green')

is what you can use to set the grid line color (and other aspects, like
linewidth, linestyle, alpha, etc).

hope that helps,

···

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Paul Ivanov
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