[pstricks] listplot

[Herbert Voss]

Am 01.07.2017 um 15:25 schrieb Poul Riis:
> With listplot I can easily make several kinds of plots of points from a 
> data file (x1,y1),(x2,y2),(x3,y3),....
> However, I would like to plot 
> (x1,0),(x1,y1),(x2,y1),(x2,0),(x2,y2),(x3,y2),....
> How can I do that?
> 
> In more general, how can I store the points from the data file in an 
> array so that I can later refer to the (postscript) coordinates of point 
> nr. i?

give a _complete_ example!

Herbert