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latest date within a range

In my data, each subject has been observed 1-10 times. The dates of these observations are in separate columns: date1, date2... date10. How can I write a function that will choose the latest of these dates within a defined range? If I simply wanted the latest overall, it would just be a maximum function, but what if I want the latest date within 2009, for example? Can anybody see a way to get this?

Thanks.

Re: latest date within a range

You can use sort and interpolate after putting the dates into an array. Say the dates are numbers and you're looking for the one before 100:

You need to check for i being 0 in case all the dates are below 100.

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