On Wed, Dec 30, 2009 at 12:05 PM, Eric Emsellem <eem...@es...> wrote: > I have tried with rgba sequences but no luck there. The help of hist > << color: matplotlib color arg or sequence of rgba tuples >> > Based on my quick look at the code, it seems that the documentation is incorrect. I believe it should be "a tuple of rgba values", not "sequence of rgba tuples", and I don't think it is possible to specify color"s" using keyword arguments. x1 = random(1000) x2 = random(1000) n, bins, patches = hist(np.array([x1, x2]).transpose()) plt.setp(patches[0], color="r") plt.setp(patches[1], color="b") also see http://matplotlib.sourceforge.net/examples/pylab_examples/hist_colormapped.html Regards, -JJ p.s., Is it just me who think it is confusing that hist([x1,x2]) interprets input differently when len(x1) == len(x2) and when len(x1) != len(x2)?