Java數值計算包：Commons Math

Commons Math 是 Apache 上一個輕量級自容器的數學和統計計算方法包，包含大多數常用的數值算法。

示例代碼：

// Create a real matrix with two rows and three columns
double[][] matrixData = { {1d,2d,3d}, {2d,5d,3d}};
RealMatrix m = new Array2DRowRealMatrix(matrixData);

// One more with three rows, two columns
double[][] matrixData2 = { {1d,2d}, {2d,5d}, {1d, 7d}};
RealMatrix n = new Array2DRowRealMatrix(matrixData2);

// Note: The constructor copies  the input double[][] array.

// Now multiply m by n
RealMatrix p = m.multiply(n);
System.out.println(p.getRowDimension());    // 2
System.out.println(p.getColumnDimension()); // 2

// Invert p, using LU decomposition
RealMatrix pInverse = new LUDecompositionImpl(p).getSolver().getInverse();

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