creating deciles in a colorbar/colormap

Hi,

I'm trying to create deciles in my colourbar. I have rainfall anomalies for 306 stations over 149 years (1863-2011) and for every month of the 149 years (12 months per year).

So far I have only figured out how to give my colorbar a set minimum and maximum value. I would prefer to be able to set my colorbar to have deciles going out in steps of 20% from the 0 value. Hence i would have 10 deciles [>80%, 80 to 60%, 60 to 40%, 40 to 20%, 20 to 0%, 0 to -20%, -20 to -40%, -40 to -60%, - 60 to -80%, <-80%]

thanks for any help anyone can provide...

ZI = griddata(x,y,z,XI,YI);
% plot the results
pcolor(xi,yi,ZI)
xlabel('Longitude (^o)')
ylabel('Latitude (^o)')
title('Mapped Rainfall Anomaly (mm/month) for January 1997')
colormap
caxis([-1000 1000])
colorbar

Answer 1

[Patrick Kalita]

You should be able to do that by setting a colormap with only 10 values. For example, using the jet colormap:

pcolor(peaks);
colormap(jet(10))
colorbar
caxis([-10 10])

For a list of other colormaps you can use see this documentation page. Any of them will accept a numeric input argument to specify the number of colors.