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Applying FindRoot to Interpolating Functions

• To: mathgroup at christensen.cybernetics.net
• Subject: [mg1897] Applying FindRoot to Interpolating Functions
• From: adler at acf2.nyu.edu (adler)
• Date: Mon, 14 Aug 1995 01:44:40 -0400
• Organization: New York University

Hi,
	I need some help with the Interpolating Function, created
by NDSolve. I am using it to solve two second order coupled ordinary
differential equations. It does so easily and I have no 
troble the solutions, x[t] and y[t]. Now I need to find the 
first value of t where x[t] == y[t]. I tried to use NRoots and 
FindRoot, but they did not work.  I can do the problem by 
inspection, looking at where the curves, x[t] vs t and y[t] vs t
intersect, but I am looking for something more accurate. 

Any help would be greatly appreciated. 

Thanks,

	Andre Adler

--
New York University
Department of Physics
adler at acf2.nyu.edu