RSSAmplifier

Dan Snow · Nov 28, 2022

Pivoting 100GB text files from long to wide

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Recently, I’ve been working on a project involving travel time matrices. These matrices are the output of specialized routing software and are used in social science research, urban planning, and policy analysis. They look like this: origin destination minutes A A 0 A B 9 A C 15 B A 10 B B 0 B C 21 C A 13 C C 0 Where origin and destination are the identifiers of geographic points (usually…

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