Marginalia

 Very nice and comprehensive post on marginal effects. 

Processing the sugar map

 Different implementations of the Sugarscpe agent-based model have different ways to get up the sugar map. SugarscapeCW used a built-in matrix (no space between each number) whereas the NetLogo model library uses an external text file with a blank space between each number. 

The easy way to translate between these two different format is to use the readr R package, something like this:

library(readr)

sugar_map1 <- read_fwf("~/tmp/sugar-map1.txt", fwf_widths(c(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1), col_names = NULL))

write_delim(sugar_map1, "~/tmp/sugar-map-out.txt", delim = " ", col_names = FALSE)