Re: [Matplotlib-users] Stacked bar graph.

[John H. <jdh...@ac...>]

>>>>> "Jason" == Jason C Leach <jas...@gm...> writes:

    Jason> hi, I'm having trouble figuring out how to add a few more
    Jason> layers to a stacked bar graph.  What I have so far is:

    Jason>         p1 = axes.bar(ind, data['n'], width, color='r') p2
    Jason> = axes.bar(ind, data['l'], width, color='y',
    Jason> bottom=data['n']) p3 = axes.bar(ind, data['m'], width,
    Jason> color='b', bottom=data['l']) p4 = axes.bar(ind, data['h'],
    Jason> width, color='g', bottom=data['m'])

    Jason> But I don't think this is correct.  I only get two layers
    Jason> (red and green).  Does anyone know the proper method?

See examples/table_demo.py -- you need to keep a cumulative sum of the
bottom positions, eg

yoff = array([0.0] * len(colLabels)) # the bottom values for stacked bar chart
for row in xrange(rows):
    bar(ind, data[row], width, bottom=yoff, color=colours[row])
    yoff = yoff + data[row]
    cellText.append(['%1.1f' % (x/1000.0) for x in yoff])

JDH