Create polygons from a matrix

April 27, 2012
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(This article was first published on me nugget, and kindly contributed to R-bloggers)


The following function matrix.poly allows for the addition of polygons to a plot based on a matrix and defined matrix positions. I have used this function on occasion to highlight specific matrix locations (e.g. in the above figure). You can do the same by overlaying another image (left in above plot) but with this function you will have all other polygon plotting possibilities (e.g. borders etc.).
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