Java Utililty Methods Double Number Almost Equal

List of utility methods to do Double Number Almost Equal

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Description

The list of methods to do Double Number Almost Equal are organized into topic(s).

Method

booleanalmost(double a, double b, double prec)
almost 
return Math.abs(a - b) / Math.abs(a + b) <= prec || (almostZero(a) && almostZero(b));
booleanalmostEqual(double a, double b)
almost Equal 
if (Math.abs(a - b) <= ABSOLUTE_EPSILON)
    return true;
double a1 = a * (1 - RELATIVE_EPSILON);
double a2 = a * (1 + RELATIVE_EPSILON);
if ((a1 <= b) && (b <= a2))
    return true;
if ((a2 <= b) && (b <= a1))
    return true;
...
booleanalmostEqual(double a, double b, double delta)
Check whether two floating point values match with a given precision. 
return Math.abs(a - b) <= delta;
booleanalmostEqual(double[][] a, double[][] b, double delta)
almost Equal 
if (a.length != b.length)
    return false;
boolean r = true;
loop1: for (int i = 0; i < a.length; i++) {
    for (int j = 0; j < a[i].length; j++) {
        double d = Math.abs((a[i][j] - b[i][j]) / b[i][j]);
        if (d > delta) {
            r = false;
...
booleanalmostEqual(final double aDouble, final double otherDouble)
almost Equal 
return Math.abs(aDouble - otherDouble) < 0.001;
booleanalmostEquals(double d1, double d2)
almost Equals 
return (d1 == 0 && d2 == 0) || Math.abs((d1 / d2) - 1) < EPSILON;
booleanalmostEquals(double d1, double d2, double epsilon)
almost Equals 
return Math.abs(d1 - d2) < epsilon;
booleanalmostEquals(double d1, double d2, double threshold)
almost Equals 
if (d1 >= d2 - threshold && d1 <= d2 + threshold) {
    return true;
} else {
    return false;