com.numericalmethod.suanshu.matrix
Interface MatrixDimension

All Known Subinterfaces:

Matrix, Matrix<T,F>, SparseMatrix

All Known Implementing Classes:

BidiagonalMatrix, BorderedHessian, ComplexMatrix, CovarianceMatrix, CsrSparseMatrix, DenseMatrix, DiagonalMatrix, DokSparseMatrix, GenericMatrix, GivensMatrix, GoldfeldQuandtTrotter, Gradient, Hessian, HilbertMatrix, ImmutableKroneckerProduct, ImmutableMatrix, Inverse, Jacobian, JordanExchange, KroneckerProduct, LilSparseMatrix, LowerTriangularMatrix, MatrixMathImpl, MatrixStorageImpl, MatthewsDavies, PermutationMatrix, Pow, PseudoInverse, RealMatrix, SubMatrixRef, SymmetricMatrix, TriangularMatrix, TridiagonalMatrix, UpperTriangularMatrix

public interface MatrixDimension

A matrix is a rectangular arrangement of numbers. Its dimension is defined by the number of rows and columns the matrix has.

We do not dictate how a matrix should be implemented. Different implementations of the mathematical concept 'matrix' implements this interface.

This interface is made minimal so that we do not list all possible matrix operations. Instead, matrix operations are grouped into packages and classes by their properties. This is to avoid interface "pollution", lengthy and cumbersome design.

See Also:

Wikipedia: Matrix (mathematics)

Method Summary

int	nCols() Get the number of columns.
int	nRows() Get the number of rows.

Method Detail

nRows

int nRows()

Get the number of rows. Rows count from 1.

Returns:

the number of rows

nCols

int nCols()

Get the number of columns. Columns count from 1.

Returns:

the number of columns