python - How to add colorbar to a histogram? -

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i have histogram (just normal histogram): enter image description here

in situation, there 20 bars (spanning x axis 0 1) , color of bar defined based on value on x axis.

what want add color spectrum 1 of in http://wiki.scipy.org/cookbook/matplotlib/show_colormaps @ bottom of histogram don't know how add it.

any appreciated!

you need specify color of faces form of colormap, example if want 20 bins , spectral colormap,

nbins = 20 colors = plt.cm.spectral(np.linspace(nbins))

you can use specify color of bars, easiest getting histogram data first (using numpy) , plotting bar chart. can add colorbar seperate axis @ bottom.

as minimal example,

import numpy np import matplotlib.pyplot plt import matplotlib mpl  nbins = 20 minbin = 0. maxbin = 1.  data = np.random.normal(size=10000) bins = np.linspace(minbin,maxbin,20)  cmap = plt.cm.spectral norm = mpl.colors.normalize(vmin=data.min(), vmax=data.max()) colors = cmap(bins)  hist, bin_edges = np.histogram(data, bins)  fig = plt.figure() ax = fig.add_axes([0.05, 0.2, 0.9, 0.7]) ax1 = fig.add_axes([0.05, 0.05, 0.9, 0.1])  cb1 = mpl.colorbar.colorbarbase(ax1, cmap=cmap,                                 norm=norm,                                 orientation='horizontal')  ax.bar(bin_edges[:-1], hist, width=0.051, color=colors, alpha=0.8) ax.set_xlim((0., 1.)) plt.show()

which yields, enter image description here


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