Calculating distances (across matrices)

October 5, 2012 | is.R()

This Gist is mostly for my future self, as a reminder of how to find distances between each row in two different matrices. To create a distance matrix from a single matrix, the function dist(), from the stats package is sufficient. There are times, ho... [Read more...]

Modifying select off-diagonal items in a matrix

September 25, 2012 | is.R()

This is something I have had the occasion to do, and never remember how, so this is legitimately a reminder to my future self of how to do things with off-diagonal elements of a matrix. Select rows and columns are easy: mat[1:10, ] or mat[, -c(5)], for... [Read more...]

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