Examples with DD com.revolsys.geometry.math.DD used on opensource projects

Example 26 with DD

use of com.revolsys.geometry.math.DD in project com.revolsys.open by revolsys.

the class DDBasicTest method testMultiplyDivide.

public void testMultiplyDivide() {
    checkMultiplyDivide(DD.PI, DD.E, 1e-30);
    checkMultiplyDivide(DD.TWO_PI, DD.E, 1e-30);
    checkMultiplyDivide(DD.PI_2, DD.E, 1e-30);
    checkMultiplyDivide(new DD(39.4), new DD(10), 1e-30);
}

Example 27 with DD

use of com.revolsys.geometry.math.DD in project com.revolsys.open by revolsys.

the class DDBasicTest method testSqrt.

public void testSqrt() {
    // the appropriate error bound is determined empirically
    checkSqrt(DD.PI, 1e-30);
    checkSqrt(DD.E, 1e-30);
    checkSqrt(new DD(999.0), 1e-28);
}

Example 28 with DD

use of com.revolsys.geometry.math.DD in project com.revolsys.open by revolsys.

the class DDBasicTest method checkAddMult2.

private void checkAddMult2(final DD dd) {
    final DD sum = dd.add(dd);
    final DD prod = dd.multiply(new DD(2.0));
    checkErrorBound("AddMult2", sum, prod, 0.0);
}

Example 29 with DD

use of com.revolsys.geometry.math.DD in project com.revolsys.open by revolsys.

the class DDBasicTest method checkBinomialSquare.

/**
 * Computes (a+b)^2 in two different ways and compares the result.
 * For correct results, a and b should be integers.
 *
 * @param a
 * @param b
 */
void checkBinomialSquare(final double a, final double b) {
    // binomial square
    final DD add = new DD(a);
    final DD bdd = new DD(b);
    final DD aPlusb = add.add(bdd);
    final DD abSq = aPlusb.multiply(aPlusb);
    // System.out.println("(a+b)^2 = " + abSq);
    // expansion
    final DD a2dd = add.multiply(add);
    final DD b2dd = bdd.multiply(bdd);
    final DD ab = add.multiply(bdd);
    final DD sum = b2dd.add(ab).add(ab);
    // System.out.println("2ab+b^2 = " + sum);
    final DD diff = abSq.subtract(a2dd);
    // System.out.println("(a+b)^2 - a^2 = " + diff);
    final DD delta = diff.subtract(sum);
    // System.out.println();
    // System.out.println("A = " + a + ", B = " + b);
    // System.out.println("[DD] 2ab+b^2 = " + sum + " (a+b)^2 - a^2 = "
    // + diff + " delta = " + delta);
    printBinomialSquareDouble(a, b);
    final boolean isSame = diff.equals(sum);
    assertTrue(isSame);
    final boolean isDeltaZero = delta.isZero();
    assertTrue(isDeltaZero);
}

Example 30 with DD

use of com.revolsys.geometry.math.DD in project com.revolsys.open by revolsys.

the class DDBasicTest method checkPow.

private void checkPow(final double x, final int exp, final double errBound) {
    final DD xdd = new DD(x);
    final DD pow = xdd.pow(exp);
    // System.out.println("Pow(" + x + ", " + exp + ") = " + pow);
    final DD pow2 = slowPow(xdd, exp);
    final double err = pow.subtract(pow2).doubleValue();
    final boolean isOK = err < errBound;
    if (!isOK) {
    // System.out.println("Test slowPow value " + pow2);
    }
    assertTrue(err <= errBound);
}