Fixes network layouts where x or y are constant #32
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If we want to plot a network in a straight line such as 1 --> 2 --> 3 by passing in an xy layout matrix, ggnetwork breaks because the rescaling function used gives NaN. I added a simple scale2() function that deals with the special case where a column is constant by just setting all values in the column = 0.5.
See error example below:
Problematic lines of code in ggnetwork:::fortify.network() :
Simple fix: change the scale functions above to scale2(), defined here: