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step_demo.py

import numpy as npy
from matplotlib.numerix import npyma as ma
from matplotlib.pyplot import step, legend, xlim, ylim, show

x = npy.arange(1, 7, 0.4)
y0 = npy.sin(x)
y = y0.copy() + 2.5

step(x, y, label='pre (default)')

y -= 0.5
step(x, y, where='mid', label='mid')

y -= 0.5
step(x, y, where='post', label='post')

y = ma.masked_where((y0>-0.15)&(y0<0.15), y - 0.5)
step(x,y, label='masked (pre)')

legend()

xlim(0, 7)
ylim(-0.5, 4)

show()


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