src/userguide/java/org/apache/commons/math4/userguide/JdkMathTestPerformance.java [369:395]:
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        double x = 0;
        long time = System.nanoTime();
        int max   = (int) JdkMath.floor(Math.sqrt(RUNS));
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += StrictMath.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long strictTime = System.nanoTime() - time;

        x = 0;
        time = System.nanoTime();
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += JdkMath.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long fastTime = System.nanoTime() - time;

        x = 0;
        time = System.nanoTime();
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += Math.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long mathTime = System.nanoTime() - time;
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src/userguide/java/org/apache/commons/math4/userguide/JdkMathTestPerformance.java [402:428]:
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        double x = 0;
        long time = System.nanoTime();
        int max   = (int) JdkMath.floor(Math.sqrt(RUNS));
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += StrictMath.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long strictTime = System.nanoTime() - time;

        x = 0;
        time = System.nanoTime();
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += JdkMath.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long fastTime = System.nanoTime() - time;

        x = 0;
        time = System.nanoTime();
        for (int i = 0; i < max; i++) {
            for (int j = 0; j < max; j++) {
                x += Math.atan2((i - max/2) * (100.0 / max), (j - max/2) * (100.0 / max));
            }
        }
        long mathTime = System.nanoTime() - time;
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