Re: GridPlot

*To*: mathgroup at smc.vnet.net*Subject*: [mg45841] Re: GridPlot*From*: bobhanlon at aol.com (Bob Hanlon)*Date*: Tue, 27 Jan 2004 04:50:33 -0500 (EST)*References*: <bv2fq7$58$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Condition is listed in the Master Index (the symbols are after the A-Z sections) as ! at #... /; Bob Hanlon In article <bv2fq7$58$1 at smc.vnet.net>, Harold.Noffke at wpafb.af.mil (Harold Noffke) wrote: << I liked your gridPlot module, and it is in my library. However, I don't understand one Mathematica programming construct you used twice. I've neither seen it before, nor have I been able to find a programmer's definition for it in the Mathematica 5.0 Help System. In the line of code ... {GrayLevel[0.], AbsoluteThickness[t_], Line[{{u_, y1_}, {u_, y2_}}]} /; you use the /-character before the semicolon. There is an earlier line where you also use this. Other than "division", I don't know what the /-character accomplishes in this context. Does it go with the semicolon (which ends lines without output)? I do know that if I take it out, your code malfunctions. If there's an reference for this in the Help System, I'd also appreciate a pointer to the correct bookmark.