2D annulus plot in MATLAB -

i create annular plot of function z=f(x,y), such as

http://www.gibmetportal.gi/images/example_polar_annulus_plot.jpg

in matlab. data (x,y,z=f(x,y)) in csv file, can read in matlab. problem x , y not given regular grid, i.e., not resemble output of meshgrid command. suggestions?

so you're problem data scattered , not on regular grid?

try doc griddata