When do we use Matrix class in java

[Neil'o]

I am reading about the Matrix class in java, but not sure about its concept, and therefore can anyone tell me when do we use Matrix class in java programming, second requirement is to how to read from the Matrix at the same time and the last requirement is to set the alignment to the records.

Thanks for your help

[tomstonsils]

JAMA is also known as Java Matrix and it is basic linear algebra package for Java.The Java Matrix Class provides the fundamental operations of numerical linear algebra. Various constructors create Matrices from two dimensional arrays of double precision floating point numbers. Various "gets" and "sets" provide access to submatrices and matrix elements. Several methods implement basic matrix arithmetic, including matrix addition and multiplication, matrix norms, and element-by-element array operations. Five fundamental matrix decompositions, which consist of pairs or triples of matrices, permutation vectors, and the like, produce results in five decomposition classes.

[Janet J]

Following are the rules that we need to follow while applying Matrix in Java.

Rule 1 : The matrix text file values (contents of the file) should be space/tab limited
For exa- 3 1 -5 -3 4

Rule 2 : The matrix text file should contain only integers
exa- 14,27,1

Rule 3 : The file should start and end with the matrix values, should not have anything else.

3 4 1 -4 -8
1 4 -2 7 -1

[machok]

Example of Use. The following simple example solves a 3x3 linear system Ax=b and computes the
norm of the residual.

double[][] array = {{1.,2.,3},{4.,5.,6.},{7.,8.,10.}};
Matrix A = new Matrix(array);
Matrix b = Matrix.random(3,1);
Matrix x = A.solve(b);
Matrix Residual = A.times(x).minus(b);
double rnorm = Residual.normInf();