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st: vertical lines between two co-ordinates in graph

From   Marco Ercolani <>
To   "" <>
Subject   st: vertical lines between two co-ordinates in graph
Date   Thu, 29 Sep 2011 10:57:31 +0100

Dear Statalisters,

Can Stata draw a vertical line between two co-ordinates of a graph? I need to do this for numerous graphs so I don't want to do it manually using a graph editor.

I need a line that starts at the intersection of two curves and reaches down to the horizontal axis. For the example below, I can draw a horizontal line at y=94 for x= 0 to 4 but not the vertical line at x=4 for y= 0 to 94.

twoway (function y =  94              , range(0  4) )/*
 */    (function y =  x^2 + 14*x +  22, range(0 7.5) )  /*
 */    (function y = -x^2 - 10*x + 150, range(0 7.5) ), /*
 */    legend(off)


Marco G. Ercolani
University of Birmingham
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