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Janusz
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R : dplyr + "meta"-columns: when a column contains names of other columns to use instead of the data
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1 day ago
R : dplyr + "meta"-columns: when a column contains names of other columns to use instead of the data
![How to Sort Multiple Columns in Google Sheets [2025 Guide]](http://i.ytimg.com/vi/j0R52DJprgo/mqdefault.jpg "How to Sort Multiple Columns in Google Sheets [2025 Guide]")
![If A = [[2,-1],[3,2]] and B = [[0,4],[-1,7]] , find (3A^2 - 2B + I).](http://i.ytimg.com/vi/0DhveErBAHA/mqdefault.jpg "If A = [[2,-1],[3,2]] and B = [[0,4],[-1,7]] , find (3A^2 - 2B + I).")
