Generate start and end positions from single point for special plot types such as heatmap, histogram, or rectangle-like which need start and end positions along the track. This function is mainly for internal use.
RCircos.Get.Start.End.Locations(plot.data, plot.width)
Data frame returned from RCircos.Get.Single.Point.Positions() and the last column is the plot locations
Non-negative integer in number of base pairs, e.g., width or heatmap or histogram of each data points