show an easy method for matching colors using pyspecdata

import pyspecdata as psd
import matplotlib.pylab as plt
from numpy import r_

# when we set the plot color, it overrides any defaults
a = psd.nddata(r_[0:9], "t", alpha=0.5)
# after we do this, we no longer need to specify the color argument to plot --
# it's a property of the data.  It chooses the next color in the default matplotlib cycle
a.set_plot_color_next()
# If you want to give a specific color, note that the above is equivalent to
# a.set_plot_color(psd.mpl_utils.default_cycler)
psd.plot(a)
# as long as we don't override that property,
# it will continue to be used
b = a + 10
psd.plot(b, alpha=0.2)
# and if we copy our properties, this gets copied as one of them
c = psd.nddata(r_[0:9] + 0.1, "t", alpha=0.2)
c.copy_props(a)
psd.plot(c, ".")
d = psd.nddata(r_[0:9] + 0.2, "t", alpha=0.2)
d += 0.1
# but wait! what if I have an unrelated set of data, but still want to move to
# the next color in the default matplotlib cycle? just do this:
d.set_plot_color_next()
psd.plot(d, ":", alpha=0.5)
plt.show()