Plotting discontinuous lines

*To*: mathgroup at smc.vnet.net*Subject*: [mg18178] Plotting discontinuous lines*From*: Virgil Stokes <virgil.stokes at neuro.ki.se>*Date*: Sat, 19 Jun 1999 23:54:34 -0400*Sender*: owner-wri-mathgroup at wolfram.com

I have a list of two sets of from,to coordinate pairs that define line segments. For example I would like to produce a plot of the form: ------- ----- -- -- ---- -- - ----- ----- ----- where the top set of line might contain the following set of (x,y) pairs for the endpoints of each line segment at y = 2: {{1,2},{7,2),{10,2,},{14,2},{16,2},{17,2},{23,2},{24,2},{30,2},{33,2}} where, {1,2},{7,2} are the x,y coordinates of the endpoints of the first line at the top. While the bottom set of line segments are defined by: {{8,-2},{9,-2},{15,-2},{15,-2},{18,-2},{22,-2},{25,-2},{29,-2},{34,-2},{38,-2}} and, {8,-2},{9,-2} are the x,y coordinates of the endpoints of the first line at the bottom The problem is how to draw, efficiently the two sets of discontinuous line segments. In general, the number of discontinuous line segments will vary from one data set to another. Perhaps this is a trivial problem; but, I have not been able to find a way to perform these type of plots in an automatic way when the size of these from, to lists are unknown in advance. Any suggestions would be appreciated. -- Virgil