Mimicking the TI calculator graph "trace" function

*To*: mathgroup at smc.vnet.net*Subject*: [mg113191] Mimicking the TI calculator graph "trace" function*From*: John Accardi <accardi at accardi.com>*Date*: Mon, 18 Oct 2010 05:46:29 -0400 (EDT)

Hello .... I'm trying to find the easiest way to get Mathematica to do what a TI-84 calculator does with the "trace" button on a graph. (displays x,y coordinates at tracing cursor positions). Alternately, I could live with having the intersection point(s) of two graphs dynamically display, with label(s), on a plot, along with the function graphs. I know I can do this in a table of values, but I want to see point and label on the graph plot. This document describes much of it, but you have to hard code the solution point to create the point label: http://amath.colorado.edu/computing/Mathematica/labelpoints/ (The above document contains a link to the *.nb being described.) I guess I am looking for any code that exists where the point label is created dynamically after a solution point is calculated and included in the plot. This seems like a very common thing to want to do but I cannot seem to find anything in the archive/forum that does anything like this. Thanks for any insights. Gianni