Hi all,
I'd like to insert two graphs on the same canvas. One is a normal xy
graph, and the other is a histogram of the y values. My problem is, how
can I insert the histogram rotated 90 degrees clockwise, at the right of
the xy graph? In short, is it possible to rotate a graph?
The idea I have in mind is to stress the meaning of a histogram as a
'projection' of the number of occurences on the y axis.
from pyx import *
from random import gauss
from scipy import arange, transpose, array, zeros, randn
from scipy.stats.stats import histogram
c = canvas.canvas()
# The first graph
# ---------------
g = graph.graphxy(width=8, height = 5)
mean = 1.0
stddev = 0.2
data = zeros(1000)
data = data + mean + stddev * randn(1000)
# Maybe this is not necessary, but I can't think of
# any easier way
data_list = [[i,m] for i,m in enumerate(list(data))]
g.plot(graph.data.list(data_list, x=1, y=2))
c.insert(g)
# The second graph: a histogram
# -----------------------------
# This is probably an awkward way to generate histograms.
# It doesn't work, but this is not the matter here.
n_bins = 50
histo, bin_min, bin_width, pts_outside = histogram(data[:], numbins=n_bins)
x_histo = scipy.arange(bin_min + 0.5 * bin_width,
step = bin_width,
stop = bin_min + n_bins * bin_width)
data_histo = transpose(array([x_histo, histo]))
h = graph.graphxy(width = 5, height = 2)
h.plot(graph.data.list(data_histo, x=1, y=2),
[graph.style.histogram()])
...
And now, I'd like to rotate graph 'h' before inserting it at the right
of graph g.
I'm sorry if this question does not make any sense.
Thanks a lot, guys
PS Any advice about how to plot the histogram in this example will also
be greatly appreciated.
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