Douglas Clark

Douglas Clark has asked 4 questions and find answers to 3 problems.

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About

Environmental consultant in Denmark, specialized in air quality monitoring and assessment, quality assurance and air quality management, policy and capacity building.

Douglas Clark questions

How to find start and end dates of monitoring locations
How to do an X[Y] data.table join, without losing an existing main key on X?
How to change the last value in each group by reference, in data.table
How to write a cumulative calculation in data.table

Douglas Clark answers

How to find start and end dates of monitoring locations
Pass column name in data.table using variable [duplicate]