dgRMatrix-class function

Sparse Compressed, Row-oriented Numeric Matrices

The dgRMatrix class is a class of sparse numeric matrices in the compressed, sparse, row-oriented format. In this implementation the non-zero elements in the rows are sorted into increasing column order.

Note: The column-oriented sparse classes, e.g., dgCMatrix, are preferred and better supported in the Matrix package.

class

Objects from the Class

Objects can be created by calls of the form new("dgRMatrix", ...).

Slots

• j:: Object of class "integer" of length nnzero (number of non-zero elements). These are the column numbers for each non-zero element in the matrix.
• p:: Object of class "integer" of pointers, one for each row, to the initial (zero-based) index of elements in the row.
• x:: Object of class "numeric" - the non-zero elements of the matrix.
• Dim:: Object of class "integer" - the dimensions of the matrix.

Methods

• diag: signature(x = "dgRMatrix"): returns the diagonal of x
• dim: signature(x = "dgRMatrix"): returns the dimensions of x
• image: signature(x = "dgRMatrix"): plots an image of x using the levelplot function

See Also

the RsparseMatrix class, the virtual class of all sparse compressed r ow-oriented matrices, with its methods. The dgCMatrix class (c olumn compressed sparse) is really preferred.