On 07/26/2010 10:13 AM, Nikolaus Rath wrote: > Hello, > > I would like to draw a couple of contour plots. The plots are on > separate figures, but they should all have exactly the same color > mapping (i.e, the same Z value should correspond to the same color in > all plots). > > What's the best way to achieve this?
I think that all you will need is to specify the same cmap (if you are not using the default) and contour levels for both plots. You should not need to use the norm, unless you are doing something fancy; and in that case, all you need to do is specify the same norm for both plots. The real key, though, is explicitly specifying the set of contour levels that you want, and using the same one for both plots. e.g.: from pylab import * # yes, this is not recommended... clevs = arange(0.3, 0.701, 0.1) fig1 = figure() contourf(rand(20,20), levels=clevs, extend='both') colorbar() fig2 = figure() contourf(rand(30,40), levels=clevs, extend='both') colorbar() show() You need to use the extend argument only if you want values beyond the levels you specify to constitute open-ended ranges. For example, if you have data values from 0 to 10, but most are between 4 and 6, you could specify levels as numpy.arange(4, 6.01, 0.1) and use extend='both'. Then all values greater than 6 would get a color at one end, and all values less than 4 would get another color at the other end. If you use a colorbar, it will see the extend argument that was used in contourf, and draw the colorbar with pointed ends to indicate "anything over" and "anything under". As illustrated above. Eric > > From the documentation I gather that I should use the norm and extend > keyword arguments, but I wasn't really able to figure out what values > I have to pass and how the matplotlib.colors.Normalize instance works. > > > Thanks, > > -Nikolaus > ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
