How to use

sumOfProducts

method

in

org.canova.api.util.MathUtils

public static double w_1(double[] x, double[] y, int n) {
 return (n * sumOfProducts(x, y) - sum(x) * sum(y)) / (n * sumOfSquares(x) - Math.pow(sum(x), 2));
}

public static double w_1(double[] x,double[] y,int n) {
  return (n*sumOfProducts(x,y) - sum(x) * sum(y))/(n*sumOfSquares(x) - Math.pow(sum(x),2));
}