[R] How to find points of intersection between harmonic function and a line

[rex.dwyer at syngenta.com]

How is the curve is represented?  That's more important that its organ-of-origin. If you have values of y=f(x) at discrete time points, then y-(x+2) will change sign sometimes... the intersection point is at some time x' in between.  Am I missing something subtle here?
You could interpolate the time more precisely in many different ways, e.g., a spline -- read  help("spline").

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of FMH
Sent: Tuesday, February 22, 2011 1:21 PM
To: r-help at r-project.org
Cc: ligges at statistik.tu-dortmund.de
Subject: [R] How to find points of intersection between harmonic function and a line

Hi,

Sorry for the very short explanation about the problem of intersection.

I have a wave function monitored from the heart beat in a particular interval of

times. Apart fom that, there is a line with positive slope (e.g: y = x+2) which
lies across the wave and intersect on a number of points. My problem is i have
no exact equation for such a complex harmonic wave produced by the heart pulse
and so, cannot manage to find the intersection points.


Therefore, i would be very grateful if someone could give some ideas or might
suggest any packages in  R that can assist me to do so.

Thank you,
Fir




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