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From: Friedrich R. <fri...@gm...> - 2010-04-08 21:54:17
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2010/4/3 ms <dev...@gm...>: > 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 |