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[ferret_users] count number of values


I am working on finding the amount of values that fall below a certain threshold. By using let aa = if TEMP LE THRESHOLD then TEMP, I can get aa to be a list of values where TEMP is less than or equal to THRESHOLD. What I would also like to do is define a new variable that is equal to the amount of values that are in aa  (ie, the non .... values).  Is there any command for this? I know in Excel the function COUNT will retrieve the number of values in a column/array etc. Is there command in Ferret that does a similar act?  Thank you very much for your help

Paul Goddard
University of Arizona

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