Java数值计算包：Commons Math
jopen
12年前
Commons Math 是 Apache 上一个轻量级自容器的数学和统计计算方法包，包含大多数常用的数值算法。
示例代码：
// 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();