Re: [Matplotlib-users] int to matplotlib.colormaps value

[Eric F. <ef...@ha...>]

AlsCdz wrote:
> Hello, i need you help!
> I want to draw a plot with circles, which are coloured according to size. So
> let's say we have a list=[1,3,5,7] that would give me four circles, first
> very small, second bigger and so on. 
> Now i need a way to "convert" integers to color value which would match
> matplotlib.cm.spectral
> values.
> 
> I hope you understand what i want to do, something like: (
> http://zoonek2.free.fr/UNIX/48_R/g208.png
> http://zoonek2.free.fr/UNIX/48_R/g208.png )
> 
> I posted only the "important" bits of code: 
> 
> 
> listData = [[2,5,1],[2,4,15],[13,2,1],[1,10,2]]
> cmap = mpl.cm.spectral
> norm = mpl.colors.Normalize(vmin=1, vmax=15)
> 
> listA = ([i for i in range(len(listData))])
> for a in range(len(listData)):
> listB = ([a for i in range(len(listData[0]))])
> area = ([listData[a][i]*100 for i in range(len(listData[a]))])
> color = ([listData[a][i]*100 for i in range(len(listData[a]))])
> plt.scatter(listA,listB,s=area, cmap=cmap, c=??what to put here???)
> 
> cb1 = mpl.colorbar.ColorbarBase(ax1, cmap=cmap, norm=norm,
> orientation='vertical')
> 
> 
> 
> I hope someone could help me!
> 
> thank you very much
> ales


radius = np.arange(10)
area = np.pi*radius**2
x = np.random.rand(10)
y = np.random.rand(10)
cmap = plt.get_cmap('spectral')
plt.scatter(x, y, s=area, c=radius, cmap=cmap)
plt.colorbar()

I think the above illustrates what you need.

Eric