PColor: Why doesn't it work for non-evenly distributed x-vectors?

I have an unevenly distributed x (time) and y vector and a matrix C with size(x,y). When I plot it with pcolor, the plot looks all weird but the y-axis looks fine. Why can it cope with non-evenly distributed y values but not with non-evenly distributed x values? What can I do to solve this?

best regards, Bernadette

[Paul]

I think this is a problem with pcolor and a time axis rather than unevenly distributed data. I have an evenly distributed matrix of ocean velocity as a function of time (x axis) and depth (y axis). If I use pcolor(time,depth,velocity) the result is similar to yours - the first half of the plot is missing. If I create an artificial x variable (x=1:length(time)) and use pcolor(x,depth,velocity) the plot looks fine.

Answer 1

[Kelly Kearney]

That's the opengl renderer acting up... quick fix:

 set(gcf, 'renderer', 'zbuffer');

More complicated fix:

http://www.mathworks.com/help/matlab/ref/opengl.html

Answer 2

[Walter Roberson]

Did you try

axis equal

?

Answer 3

[Bernadette]

No, unfortunately this doesn't make it better. By writing "axis equal" the plot is somehow shrinked to a small vertical line. But maybe I was not clear enough:

so my code looks like this: pcolor(time,GF,GF_500');

where time is a non-evenly distribted vector GF as well and GF_500 is a matrix with size(GF,time)

unfortunately the graph then looks like this?!