def plotLines(a):
"""Plot the elements of array a as line end-points."""
n = len(a)
stddraw.setXscale(-1, n)
stddraw.setPenRadius(0.0)
for i in range(1, n):
stddraw.line(i - 1, a[i - 1], i, a[i])
def plotPoints(a):
"""Plot the elements of array a as points."""
n = len(a)
stddraw.setXscale(-1, n)
stddraw.setPenRadius(1.0 / (3.0 * n))
for i in range(n):
stddraw.point(i, a[i])
def plotBars(a):
"""
Plot the elements of array a as bars.
"""
n = len(a)
stddraw.setXscale(-1, n)
for i in range(n):
stddraw.filledRectangle(i - 0.25, 0.0, 0.5, a[i])