A generic drug is the same as a brand-name drug in dosage, safety, strength, quality, the way it works, the way it is taken and the way it should be used. FDA requires generic drugs have the same high quality, strength, purity and stability as brand-name drugs.
A matrix is a rectangular array of numbers arranged in rows and columns. The array of numbers below is an example of a matrix. The number of rows and columns that a matrix has is called its dimension or its order. By convention, rows are listed first; and columns, second.
SAS/IML Matrices and Matrix Operators. A matrix is the fundamental structure in the SAS/IML language, and the software provides many ways to create matrices. You associate a name with a matrix when you create or define the matrix.