Custom levels in contourf

Hi,

I am trying the get a contourf plot with the levels I want, but I am not able. MATLAB does not let me like in the documentation example.

I am trying to plot CI matrix (field) with levels like in this figure, i.e., not equally spaced: http://www.atmos.albany.edu/student/abentley/realtime/images/northamer/coupling/coupling_57.png

My try:

load variablesForQuestion
v20=[-25 -20 -15 -10 -5 0 5 10 15 22.5 25];
[C,h] = contourf(lon,lati,CI,v20); colorbar()

Thanks!

[Turlough Hughes]

Best to attach the variables in your question. You can use:

save variablesForQuestion lon lati CI v20

and attach the corresponding variablesForQuestion.mat file either in a comment or by editing your question.

[JUAN JESUS GONZALEZ ALEMAN]

I have uploaded them.

[Walter Roberson]

It is not obvious what the difference is between what you want and what you get?

Answer 1

[Chunru]

load variablesForQuestion
v20=[-25 -20 -15 -10 -5 0 5 10 15 22.5 25];
subplot(131);
% Your data CI has range from -17 t0 100
[C,h] = contourf(lon,lati,CI); colorbar
subplot(132);
% The custom level has a much smaller range [-25 25], so the contour plot
% has large patch of yellow color (25 and above)
[C,h] = contourf(lon,lati,CI,v20); colorbar
subplot(133);
% You need a suitable custom level. For example
v20=[-20 -15 -10 -5 0 5 10 15 22.5 25 40 60 80 100];
[C,h] = contourf(lon,lati,CI,v20); colorbar