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I'm looking for a function, where the result is something like this:

enter image description here

I tried to figure it out myself, but I have no idea how to manage it. f(x) = ...

Thanks in advance,

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closed as off topic by Steven Landsburg, Will Sawin, Chris Godsil, Noah Stein, Dan Petersen Jan 18 '13 at 17:38

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The heart beat function for a dead guy is defined by $f(x)=0.$ – Joseph Van Name Jan 19 '13 at 0:02
Hodgkin-Huxley gives a system of differential equations whose solutions look pretty close. As in the normal pattern is a limit cycle. – AHusain Apr 25 at 21:46
up vote 7 down vote accepted

A silly answer would be "fit a spline to your curve", but the meaningful answer tries to extract information on the condition of the heart from the characteristic features of the electrocardiogram; there is an extensive literature on this problem, see for example:

Functional Data Analytic Approach of Modeling ECG T-wave Shape to Measure Cardiovascular Behavior.

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