I found the pdf figures (4-panel pcolor plots) that export_fig creates on a linux box are rendered very slowly in Preview on my macbook pro (mac os x snow leopard). Does anyone encounter a similar issue? I wonder what's the cause of the problem. The pdf figures are not particularly large (about 5 MB each). Thanks.
First, PCOLOR(X,Y,C) regards X,Y as the edges of pixels, while IMAGESC(X,Y,C) regards X,Y as the centers of pixels. The latter is what I need.
Second, what I want is not 'interp' but 'faceted', namely facet lines at the edges of pixels, which is what PCOLOR does by default: