I have a binary rectangular T/F matrix; I need to be able to calculate the shortest path (i.e., Pythagorean distance) between a populated cell in row j and any populated cell in some row j+n.
For instance, if I have a chessboard with random black/white square colors, I need the shortest distance (linear distance, not number of steps) for a king to get from a specified black space on the first row, to _any_ black space in a specified further row, traveling only on black spaces. Any idea? Thanks, -bryan [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.