units_scatter.py

"""
Demonstrate unit handling

basic_units is a mockup of a true units package used for testing
purposed, which illustrates the basic interface that a units package
must provide to matplotlib.

The example below shows support for unit conversions over masked
arrays.
"""
import numpy as np
from basic_units import secs, hertz, minutes
from matplotlib.pylab import figure, show

# create masked array


xsecs = secs*np.ma.MaskedArray((1,2,3,4,5,6,7,8), (1,0,1,0,0,0,1,0), np.float)
#xsecs = secs*np.arange(1,10.)

fig = figure()
ax1 = fig.add_subplot(3,1,1)
ax1.scatter(xsecs, xsecs)
#ax1.set_ylabel('seconds')
ax1.axis([0,10,0,10])

ax2 = fig.add_subplot(3,1,2, sharex=ax1)
ax2.scatter(xsecs, xsecs, yunits=hertz)
ax2.axis([0,10,0,1])

ax3 = fig.add_subplot(3,1,3, sharex=ax1)
ax3.scatter(xsecs, xsecs, yunits=hertz)
ax3.yaxis.set_units(minutes)
ax3.axis([0,10,0,1])

show()