我想用 apache commonmath3.3 lib 计算一些实验的积分。
我看到了这个问题。
SimpsonIntegrator simpson = new SimpsonIntegrator();
TrapezoidIntegrator trapezoid = new TrapezoidIntegrator();
double[] vector = new double[2];
vector[0] = 0;
vector[1] = 1;
PolynomialFunction f = new PolynomialFunction(vector);
UnivariateFunction uf = (UnivariateFunction)new PolynomialFunction(vector);
System.out.println("To String " + uf.toString());
System.out.println("Degree: " + f.degree());
double i = simpson.integrate(10, uf, -Float.MAX_VALUE, Float.MAX_VALUE);
double j = trapezoid.integrate(10, uf, 0, 1);
System.out.println("Simpson integral : " + i);
System.out.println("Trapezoid integral : " + j);
我认为我们必须为整数的间隔创建一个双数组。但是当我想创建大小超过 2 的数组时,我会给出以下信息:
Caused by:org.apache.commons.math3.exception.TooManyEvaluationsException: illegal state: maximal count (10) exceeded: evaluations 05-27 08:11:33.461: E/AndroidRuntime(1349): at org.apache.commons.math3.analysis.integration.BaseAbstractUnivariateIntegrator.computeObjec tiveValue(BaseAbstractUnivariateIntegrator.java:218)
我错过了什么吗?
如何声明积分函数?
例如,我如何为积分声明“x^2+3”函数?