Examples with MathContext java.math.MathContext used on opensource projects

Example 91 with MathContext

use of java.math.MathContext in project big-math by eobermuhlner.

the class FunctionTable method printTableSin.

public static void printTableSin() {
    MathContext mathContext = new MathContext(20);
    printTable(0, 10, 0.1, Arrays.asList("BigDecimalMath.sin", "Math.sin"), Arrays.asList(x -> BigDecimalMath.sin(x, mathContext), x -> BigDecimal.valueOf(Math.sin(x.doubleValue()))));
}

Example 92 with MathContext

use of java.math.MathContext in project big-math by eobermuhlner.

the class BigDecimalMathExperimental method sqrtUsingHalleyPrint.

public static BigDecimal sqrtUsingHalleyPrint(BigDecimal x, MathContext mathContext) {
    switch(x.signum()) {
        case 0:
            return ZERO;
        case -1:
            throw new ArithmeticException("Illegal sqrt(x) for x < 0: x = " + x);
    }
    MathContext mc = new MathContext(mathContext.getPrecision() + 4, mathContext.getRoundingMode());
    BigDecimal acceptableError = ONE.movePointLeft(mathContext.getPrecision() + 1);
    BigDecimal threeX = x.multiply(THREE);
    BigDecimal result = BigDecimal.valueOf(Math.sqrt(x.doubleValue()));
    BigDecimal last;
    do {
        last = result;
        BigDecimal resultSquare = result.multiply(result);
        BigDecimal divisor = resultSquare.multiply(THREE).add(x);
        result = resultSquare.add(threeX).multiply(result).divide(divisor, mc);
        System.out.printf("%5d, ", countSameCharacters(last.toPlainString(), result.toPlainString()));
    } while (result.subtract(last).abs().compareTo(acceptableError) > 0);
    return result.round(mathContext);
}

Example 93 with MathContext

use of java.math.MathContext in project big-math by eobermuhlner.

the class BigDecimalMathExperimental method rootAdaptivePrecision.

public static BigDecimal rootAdaptivePrecision(BigDecimal n, BigDecimal x, MathContext mathContext, int initialPrecision) {
    switch(x.signum()) {
        case 0:
            return ZERO;
        case -1:
            throw new ArithmeticException("Illegal root(x) for x < 0: x = " + x);
    }
    int maxPrecision = mathContext.getPrecision() + 4;
    BigDecimal acceptableError = ONE.movePointLeft(mathContext.getPrecision() + 1);
    BigDecimal nMinus1 = n.subtract(ONE);
    BigDecimal result = x.divide(TWO, MathContext.DECIMAL32);
    int adaptivePrecision = initialPrecision;
    BigDecimal step;
    do {
        adaptivePrecision = adaptivePrecision * 3;
        if (adaptivePrecision > maxPrecision) {
            adaptivePrecision = maxPrecision;
        }
        MathContext mc = new MathContext(adaptivePrecision, mathContext.getRoundingMode());
        step = x.divide(BigDecimalMath.pow(result, nMinus1, mc), mc).subtract(result, mc).divide(n, mc);
        result = result.add(step, mc);
    } while (adaptivePrecision < maxPrecision || step.abs().compareTo(acceptableError) > 0);
    return result.round(mathContext);
}

Example 94 with MathContext

use of java.math.MathContext in project big-math by eobermuhlner.

the class BigDecimalMathExperimental method expReducing.

public static BigDecimal expReducing(BigDecimal x, MathContext mathContext, int reduce) {
    MathContext mc = new MathContext(mathContext.getPrecision() + 4, mathContext.getRoundingMode());
    x = x.divide(valueOf(reduce), mc);
    BigDecimal result = ExpCalculator.INSTANCE.calculate(x, mc);
    result = BigDecimalMath.pow(result, reduce, mc);
    return result.round(mathContext);
}

Example 95 with MathContext

use of java.math.MathContext in project big-math by eobermuhlner.

the class BigDecimalMathExperimental method acosUsingNewton.

public static BigDecimal acosUsingNewton(BigDecimal x, MathContext mathContext) {
    if (x.compareTo(ONE) > 0) {
        throw new ArithmeticException("Illegal acos(x) for x > 1: x = " + x);
    }
    if (x.compareTo(MINUS_ONE) < 0) {
        throw new ArithmeticException("Illegal acos(x) for x < -1: x = " + x);
    }
    MathContext mc = new MathContext(mathContext.getPrecision() + 6, mathContext.getRoundingMode());
    BigDecimal result = BigDecimalMath.pi(mc).divide(TWO, mc).subtract(asinUsingNewton(x, mc), mc);
    return result.round(mathContext);
}