(This article was first published on Shravan Vasishth's Slog (Statistics blog), and kindly contributed to R-bloggers)
I foolishly tried to convert a matrix M to a vector using vector:vector(M)
But this is done column wise, so that adjacent row items end up non-adjacent.
The right way to do this seems to be:
library(data)
unmatrix(M, byrow=TRUE)
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