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One way would be to store the last meaningful time index for each patient. SO you might have this: dimensions: numberofpatients=2000; variables: int lastentry(numberofpatients); Assuming you keep this uptodate, you would then know for each patient how many entries existed. If (as you indicated in a previous message) there are gaps in the data (normal vs treatment) then you will have to skip over fill values. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: FQQ-870725 Department: Support netCDF Priority: High Status: Closed