Java Utililty Methods Distance Calculate

List of utility methods to do Distance Calculate

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Description

The list of methods to do Distance Calculate are organized into topic(s).

Method

doubledistance(double[] a, double[] b)
Calculates the distance between two points represented by (n-dimensional) vectors. 
double dist = 0;
for (int i = 0; i < a.length; i++) {
    double d = a[i] - b[i];
    dist += d * d;
return Math.sqrt(dist);
doubledistance(double[] a, double[] b)
Measure distance between a and b 
return Math.sqrt(Math.pow(a[0] - b[0], 2) + Math.pow(a[1] - b[1], 2));
doubledistance(double[] p1, double[] p2)
distance 
int nd = p1.length;
double out = 0.0;
for (int d = 0; d < nd; d++) {
    out += (p1[d] - p2[d]) * (p1[d] - p2[d]);
return Math.sqrt(out);
doubledistance(double[] p1, double[] p2)
distance 
double sum = 0;
for (int i = 0; i < p1.length; i++) {
    sum += Math.pow(p1[i] - p2[i], 2);
return Math.sqrt(sum);
doubledistance(double[] x, int p, int q, int dim)
computes the euclidean distance of two dim-dimensional points 
double sum = 0.0;
for (int i = 0; i < dim; ++i) {
    sum += Math.pow(x[p * dim + i] - x[q * dim + i], 2);
return Math.sqrt(sum);
intdistance(final Class child, final Class parent)
Gets derivation distance of an object
Possible values are:
- -1 = child !instanceof parent
- 0 = child is the same class as the parent one
- greater than 0 = child is the nth of the parent

Copied from
https://github.com/apache/commons-lang/blob/master/src/main/java/org/apache/commons/lang3/reflect/InheritanceUtils.java 
if (child == null || parent == null) {
    return -1;
if (child.equals(parent)) {
    return 0;
final Class<?> cParent = child.getSuperclass();
int d = parent.equals(cParent) ? 1 : 0;
...
doubledistance(final double x, final double y)
Returns the Euclidean distance between the origin and the point (x, y). 
return Math.sqrt(x * x + y * y);
doubledistance(final double x1, final double y1, final double x2, final double y2)
Calculate the distance between two coordinates. 
final double dx = x2 - x1;
final double dy = y2 - y1;
final double distance = Math.sqrt(dx * dx + dy * dy);
return distance;
Doubledistance(final double x1, final double y1, final double x2, final double y2)
distance 
final double dx = Math.max(x1, x2) - Math.min(x1, x2);
final double dy = Math.max(y1, y2) - Math.min(y1, y2);
return Math.sqrt(dx * dx + dy * dy);
doubledistance(final double[] a, final double[] b)
get the length of (a - b). 
return Math.sqrt(squareDistance(a, b));