2010/4/3 ms <deviceran...@gmail.com>: > I am trying to use griddata to plot some (irregularly) spaced data as a > contour plot, but sometimes ALL the grid it outputs is masked: so no plot. > > In the docs I read: > "A masked array is returned if any grid points are outside convex hull > defined by input data (no extrapolation is done)." > > but I have no real idea of what does it mean. > Any suggestion to troubleshoot / understand what's going on?
When you do trinangulation, the lines between all pairs of points define an inner region and an outer region, I guess, the inner region is meant by "outside convex hull". I furthermore guess, that all your interpolation points are outside this hull, i.e., your interpolation spacing is of comparable order of magnitude as your input data extent? Friedrich ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
