使用 Jama 库进行矩阵乘法
我想使用 Jama 库乘以 2 个矩阵，但它返回：
A col: 4 row: 4
B col: 1 row: 4
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Matrix dimensions must agree.
我的代码：
double[][] arrA = { {1,0,0,0}, {0, Math.cos(0.34), -Math.sin(0.34), 0}, {0, Math.sin(0.34), Math.cos(0.34), 0}, {0,0,0,1} };
double[][] arrB = { {x}, {y}, {z}, {1} };
Matrix A = new Matrix(arrA, 4, 4);
Matrix B = new Matrix(arrB, 4, 1);
A.print(1, 1);
B.print(1, 1);
System.out.println("A col: " + A.getColumnDimension() + " row: " + A.getRowDimension());
System.out.println("B col: " + B.getColumnDimension() + " row: " + B.getRowDimension());
Matrix C = A.arrayTimes(B);
I want to multiply 2 matrix using Jama library but it returns:
A col: 4 row: 4
B col: 1 row: 4
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Matrix dimensions must agree.
My code:
double[][] arrA = { {1,0,0,0}, {0, Math.cos(0.34), -Math.sin(0.34), 0}, {0, Math.sin(0.34), Math.cos(0.34), 0}, {0,0,0,1} };
double[][] arrB = { {x}, {y}, {z}, {1} };
Matrix A = new Matrix(arrA, 4, 4);
Matrix B = new Matrix(arrB, 4, 1);
A.print(1, 1);
B.print(1, 1);
System.out.println("A col: " + A.getColumnDimension() + " row: " + A.getRowDimension());
System.out.println("B col: " + B.getColumnDimension() + " row: " + B.getRowDimension());
Matrix C = A.arrayTimes(B);
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评论（2）
您想要执行
A. times(B)用于矩阵乘法。arrayTimes< /a> 是逐个元素相乘。You want to do
A.times(B)for matrix multiplication.arrayTimesis element by element multiplication.要更深入地了解 JAMA，我强烈建议：http://math.nist.gov/javanumerics /jama/doc/
For a deeper idea about JAMA, I really suggest: http://math.nist.gov/javanumerics/jama/doc/