The United States Organization for Standardization and the joint development of MD University. Realize java matrix package. JAMA composed by six java category: Matrix, CholeskyDecomposition, LUDecomposition QRDecomposition SingularValueDecomposition EigenvalueDecomposition. It provides a wide range of structural function, the rich get, set to visit sub-matrix and element matrix. Have basic matrix operations: matrix increase, multiplication, matrix norm. and provides a convenient matrix print method. provides a separation of five basic types of matrix. can call Matrix category for their linear terms, matrix inversion and other methods.