FunctionUtils { @Deprecated public static DifferentiableUnivariateFunction toDifferentiableUnivariateFunction(final UnivariateDifferentiableFunction f) { return new DifferentiableUnivariateFunction() { public double value(final double x) { return f.value(x); } public UnivariateFunction derivative() { return new UnivariateFunction() { public double value(final double x) { return f.value(new DerivativeStructure(1, 1, 0, x)).getPartialDerivative(1); } }; } }; } private  FunctionUtils(); static UnivariateFunction compose(final UnivariateFunction ... f); static UnivariateDifferentiableFunction compose(final UnivariateDifferentiableFunction ... f); @Deprecated static DifferentiableUnivariateFunction compose(final DifferentiableUnivariateFunction ... f); static UnivariateFunction add(final UnivariateFunction ... f); static UnivariateDifferentiableFunction add(final UnivariateDifferentiableFunction ... f); @Deprecated static DifferentiableUnivariateFunction add(final DifferentiableUnivariateFunction ... f); static UnivariateFunction multiply(final UnivariateFunction ... f); static UnivariateDifferentiableFunction multiply(final UnivariateDifferentiableFunction ... f); @Deprecated static DifferentiableUnivariateFunction multiply(final DifferentiableUnivariateFunction ... f); static UnivariateFunction combine(final BivariateFunction combiner,
                                             final UnivariateFunction f,
                                             final UnivariateFunction g); static MultivariateFunction collector(final BivariateFunction combiner,
                                                 final UnivariateFunction f,
                                                 final double initialValue); static MultivariateFunction collector(final BivariateFunction combiner,
                                                 final double initialValue); static UnivariateFunction fix1stArgument(final BivariateFunction f,
                                                    final double fixed); static UnivariateFunction fix2ndArgument(final BivariateFunction f,
                                                    final double fixed); static double[] sample(UnivariateFunction f, double min, double max, int n); @Deprecated static DifferentiableUnivariateFunction toDifferentiableUnivariateFunction(final UnivariateDifferentiableFunction f); @Deprecated static UnivariateDifferentiableFunction toUnivariateDifferential(final DifferentiableUnivariateFunction f); @Deprecated static DifferentiableMultivariateFunction toDifferentiableMultivariateFunction(final MultivariateDifferentiableFunction f); @Deprecated static MultivariateDifferentiableFunction toMultivariateDifferentiableFunction(final DifferentiableMultivariateFunction f); @Deprecated static DifferentiableMultivariateVectorFunction toDifferentiableMultivariateVectorFunction(final MultivariateDifferentiableVectorFunction f); @Deprecated static MultivariateDifferentiableVectorFunction toMultivariateDifferentiableVectorFunction(final DifferentiableMultivariateVectorFunction f);  }
@Test @Deprecated public void testToDifferentiableUnivariateFunction() { Sin sin = new Sin(); DifferentiableUnivariateFunction converted = FunctionUtils.toDifferentiableUnivariateFunction(sin); for (double x = 0.1; x < 0.5; x += 0.01) { Assert.assertEquals(sin.value(x), converted.value(x), 1.0e-10); Assert.assertEquals(sin.derivative().value(x), converted.derivative().value(x), 1.0e-10); } }