Hi, The best I could come up with was: def sinc(r): na.Error.pushMode(all="ignore") a = na.where(r, na.divide(na.sin(r),r), 1) na.Error.popMode() return a but I still seem to get a warning...

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F.sinc(0) Warning: Encountered invalid numeric result(s) in divide 1.0

Thanks, Sebastian Haase