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Add stairstep plotting functionality #1068

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Add stairstep plotting functionality #1068

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861190a
Add stairstep plotting functionality
dmcdougall Aug 10, 2012
c5c4dca
Add stairstep plot example
dmcdougall Aug 10, 2012
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10 changes: 10 additions & 0 deletions examples/pylab_examples/stairs_demo.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
import numpy as np
from matplotlib import pyplot as plt

x = np.linspace(-2*np.pi, 2*np.pi, num=40, endpoint=True)
y = np.sin(x)

fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.stairs(x, y)
plt.show()
5 changes: 5 additions & 0 deletions lib/matplotlib/axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@
import matplotlib.quiver as mquiver
import matplotlib.scale as mscale
import matplotlib.stackplot as mstack
import matplotlib.stairs as mstairs
import matplotlib.streamplot as mstream
import matplotlib.table as mtable
import matplotlib.text as mtext
Expand Down Expand Up @@ -6415,6 +6416,10 @@ def stackplot(self, x, *args, **kwargs):
return mstack.stackplot(self, x, *args, **kwargs)
stackplot.__doc__ = mstack.stackplot.__doc__

def stairs(self, *args, **kwargs):
return mstairs.stairs(self, *args, **kwargs)
stairs.__doc__ = mstairs.stairs.__doc__

def streamplot(self, x, y, u, v, density=1, linewidth=None, color=None,
cmap=None, norm=None, arrowsize=1, arrowstyle='-|>',
minlength=0.1):
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45 changes: 45 additions & 0 deletions lib/matplotlib/stairs.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
"""
Stairstep plots.
"""

import numpy as np

__all__ = ['stairs']

def stairs(axes, *args, **kwargs):
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To be consistent with the rest of the code-base, I would change "axes" to "ax"

"""Draws a stairstep plot
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Put the triple quote on its own line.


Parameters
----------
Takes either one or two arguments. Valid calls are:

ax.stairs(y) # Make a stairstep plot of the values in *y*
ax.stairs(x, y) # Stairstep plot of the values in *y* at points in *x*

*x*, *y* : 1d arrays.

Returns
-------
*lines* : :class:`~matplotlib.collections.LineCollection`
Line collection defining all the steps in the stairstep plot
"""

if len(args) == 1:
y = np.asarray(args[0])
x = np.arange(len(y))
elif len(args) == 2:
x = np.asarray(args[0])
y = np.asarray(args[1])
else:
raise ValueError, "stairs takes either 1 or 2 arguments, %d given" % len(args)

d = 0.5 * np.abs(np.diff(x))
dm = np.append(d[0], d)
dp = np.append(d, d[-1])

xm = x - dm
xp = x + dp
x_all = np.dstack((xm, x, xp)).flatten()
y_all = np.dstack((y, y, y)).flatten()

return axes.plot(x_all, y_all, **kwargs)