[PLAIN]http://picasaweb.google.com/lh/photo/Z35aAZ1CbEqbEgymi8Xs5w?feat=directlink [Broken] Hi, I plotted this figure but it turned out that the original geometry has been distorted. I mean the geometry I'm calculating is like this: a rectangle with two triangles attached, one to the upper-right, one to the middle. I'm sorry I couldn't provide a figure to illustrate here and I hope it's understandable. I guess the problem could be due to interpolation but I'm not sure. here's the command: xlin = linspace(min(x),max(x),100); ylin = linspace(min(y),max(y),100); [X,Y]=meshgrid(xlin,ylin); Z=griddata(x,y,z,X,Y,'cubic'); surf(Z); view(0,90); shading interp; Thanks for any help or suggestion!