On Mon, Oct 31, 2011 at 11:02 AM, Tommy Grav <tg...@mac.com> wrote:
> Hi,
>
> I have been looking around but can't find what I want.
> I have two arrays, one with numbers from 0.02 to 0.20 and
> the other from 0.03 to 0.50. I am trying to plot them together
> with other arrays in a scatterplot where these two are the
> color term
>
> plt.scatter(x1,y1,c=myarr1,cmap=plt.get_cmap("gist_heat))
> plt.scatter(x2,y2,c=myarr2,cmap=plt.get_cmap("gist_heat))
>
> but it seems that each instance of the plot command rescales
> the array such that myarr1.max() and myarr2.max() are both with,
> which means that the two color scales are out of sync. Is there
> a way to force the two plots to respect the values in the array
> have the cmap go from 0 to 1, not from myarr1.min() to myarr1.max()?
>
> Cheers
> Tommy
>
>
Tommy,
The general method is to use a Normalize object and pass it as kwarg
'norm'. However, as a convenience, some plotting functions has a 'vmin'
and 'vmax' kwarg that can be specified:
plt.scatter(x1,y1,c=myarr1,cmap=plt.get_cmap("gist_heat), vmin=0.0,
vmax=1.0)
plt.scatter(x2,y2,c=myarr2,cmap=plt.get_cmap("gist_heat), vmin=0.0,
vmax=1.0)
Cheers!
Ben Root
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