Java Sqrt类代码示例

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
@Test
public void testMath832() {
    final UnivariateFunction f = new UnivariateFunction() {
            private final UnivariateDifferentiableFunction sqrt = new Sqrt();
            private final UnivariateDifferentiableFunction inv = new Inverse();
            private final UnivariateDifferentiableFunction func
                = FunctionUtils.add(FunctionUtils.multiply(new Constant(1e2), sqrt),
                                    FunctionUtils.multiply(new Constant(1e6), inv),
                                    FunctionUtils.multiply(new Constant(1e4),
                                                           FunctionUtils.compose(inv, sqrt)));

            public double value(double x) {
                return func.value(new DerivativeStructure(1, 1, 0, x)).getPartialDerivative(1);
            }

        };

    BrentSolver solver = new BrentSolver();
    final double result = solver.solve(99, f, 1, 1e30, 1 + 1e-10);
    Assert.assertEquals(804.93558250, result, 1e-8);
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
/**
 * Returns the square root of {@code this} diagonal operator. More
 * precisely, this method returns
 * P = diag(1 / &radic;A<sub>11</sub>, 1 / &radic;A<sub>22</sub>, &hellip;).
 *
 * @return the square root of {@code this} preconditioner
 * @since 3.1
 */
public RealLinearOperator sqrt() {
    final RealVector sqrtDiag = diag.map(new Sqrt());
    return new RealLinearOperator() {
        /** {@inheritDoc} */
        @Override
        public RealVector operate(final RealVector x) {
            return new ArrayRealVector(MathArrays.ebeDivide(x.toArray(),
                                                            sqrtDiag.toArray()),
                                       false);
        }

        /** {@inheritDoc} */
        @Override
        public int getRowDimension() {
            return sqrtDiag.getDimension();
        }

        /** {@inheritDoc} */
        @Override
        public int getColumnDimension() {
            return sqrtDiag.getDimension();
        }
    };
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
/**
 * Returns the square root of {@code this} diagonal operator. More
 * precisely, this method returns
 * P = diag(1 / &radic;A<sub>11</sub>, 1 / &radic;A<sub>22</sub>, &hellip;).
 *
 * @return the square root of {@code this} preconditioner
 */
public RealLinearOperator sqrt(){
    final RealVector sqrtDiag = diag.map(new Sqrt());
    return new RealLinearOperator() {
        /** {@inheritDoc} */
        @Override
        public RealVector operate(final RealVector x) {
            return x.ebeDivide(sqrtDiag);
        }

        /** {@inheritDoc} */
        @Override
        public int getRowDimension() {
            return sqrtDiag.getDimension();
        }

        /** {@inheritDoc} */
        @Override
        public int getColumnDimension() {
            return sqrtDiag.getDimension();
        }
    };
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
protected UnivariateFunction[] createFunctions() {
    return new UnivariateFunction[] {
        new Power(2.0), new Exp(), new Expm1(), new Log(), new Log10(),
        new Log1p(), new Cosh(), new Sinh(), new Tanh(), new Cos(),
        new Sin(), new Tan(), new Acos(), new Asin(), new Atan(),
        new Inverse(), new Abs(), new Sqrt(), new Cbrt(), new Ceil(),
        new Floor(), new Rint(), new Signum(), new Ulp()
    };
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
@Override
protected UnivariateFunction[] createFunctions() {
    return new UnivariateFunction[] {
        new Power(2.0), new Exp(), new Expm1(),
        new Log1p(), new Cosh(), new Sinh(), new Tanh(), new Cos(),
        new Sin(), new Tan(), new Acos(), new Asin(), new Atan(),
        new Abs(), new Sqrt(), new Cbrt(), new Ceil(),
        new Floor(), new Rint(), new Signum()
    };
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
private UnivariateFunction[] createFunctions() {
    return new UnivariateFunction[] {
        new Power(2.0), new Exp(), new Expm1(), new Log(), new Log10(),
        new Log1p(), new Cosh(), new Sinh(), new Tanh(), new Cos(),
        new Sin(), new Tan(), new Acos(), new Asin(), new Atan(),
        new Inverse(), new Abs(), new Sqrt(), new Cbrt(), new Ceil(),
        new Floor(), new Rint(), new Signum(), new Ulp()
    };
}
 

import org.apache.commons.math3.analysis.function.Sqrt; //导入依赖的package包/类
public Variable squareRoot(Transform transform, Variable numericVariable, Map<String, TransformOption> options) throws Exception {
    UnivariateDifferentiableFunction function = new Sqrt();
    double[] origData = numericVariable.getData();
    double[] newData = new double[origData.length];
    for (int i = 0; i < origData.length; i++) {
        newData[i] = function.value(origData[i]);
    }

    Instances weka = new Util().createWekaData(newData, transform.toString());
    return new Variable(numericVariable, transform, transform.toString(), numericVariable.getLab(), newData, weka, numericVariable.getDateFormat(), VariableType.NUMERIC);
}