Java Number Minus minusPIO2(final double angRad)

Description

minus PIO

License

Open Source License

Parameter

Parameter	Description
angRad	An angle, in radians.

Return

angRad - PI/2, accurately computed.

Declaration

public static double minusPIO2(final double angRad) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    private static final double PIO2_HI = Double.longBitsToDouble(0x3FF921FB54400000L);
    private static final double PIO2_LO = Double.longBitsToDouble(0x3DD0B4611A626331L);

    /**/*  w  w  w  .  jav  a 2 s  . co m*/
     * @param angRad
     *            An angle, in radians.
     * @return angRad - PI/2, accurately computed.
     */
    public static double minusPIO2(final double angRad) {
        if (angRad < Math.PI / 4) {
            // LO then HI, for better accuracy (if starting near 0).
            return angRad - PIO2_LO - PIO2_HI;
        } else {
            // HI then LO, for better accuracy (if ending near 0).
            return angRad - PIO2_HI - PIO2_LO;
        }
    }
}

Related

1. minusEquals(int[] vals, int min)
2. minusEqualsInverse(double[] w, double[] v, double a)
3. minusExact(final int a, final int b)
4. minusExact(long a, long b)
5. minusPercent(float maxValue, float minusValue)