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package uk.ac.ox.cs.pagoda.util;
/***
* Get an exponential function given two points.
*/
public class ExponentialInterpolation {
private final double base;
private final double multiplicativeFactor;
/***
* Compute the exponential function passing for the 2 given points.
*
* @param x1
* @param y1
* @param x2
* @param y2
*/
public ExponentialInterpolation(double x1, double y1, double x2, double y2) {
base = Math.pow(y2/y1, 1 / (x2 - x1));
multiplicativeFactor = y1 / Math.pow(base, x1);
}
/***
* Compute value of the function in x.
*
* @param x
* @return
*/
public double computeValue(double x) {
return multiplicativeFactor * Math.pow(base, x);
}
}
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