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pkg/man/sscMatrix-class.Rd revision 476, Wed Feb 2 11:51:24 2005 UTC pkg/man/dsCMatrix-class.Rd revision 880, Tue Aug 30 14:36:41 2005 UTC
# Line 1  Line 1 
1  \name{sscMatrix-class}  \name{dsCMatrix-class}
 \docType{class}  
 \alias{sscMatrix-class}  
 \alias{solve,sscMatrix,matrix-method}  
 \alias{chol,sscMatrix,missing-method}  
 \alias{chol,sscMatrix,logical-method}  
 \alias{t,sscMatrix-method}  
 \alias{coerce,sscMatrix,tripletMatrix-method}  
 \alias{coerce,sscMatrix,geMatrix-method}  
 \alias{coerce,sscMatrix,matrix-method}  
 \alias{determinant,sscMatrix,missing-method}  
 \alias{determinant,sscMatrix,logical-method}  
2  \title{Symmetric, compressed, sparse column matrices}  \title{Symmetric, compressed, sparse column matrices}
3  \description{The \code{sscMatrix} class is a class of symmetric, sparse  \docType{class}
4    \alias{dsCMatrix-class}
5    \alias{dsTMatrix-class}
6    \alias{solve,dsCMatrix,matrix-method}
7    \alias{solve,dsCMatrix,dgeMatrix-method}
8    \alias{chol,dsCMatrix,missing-method}
9    \alias{chol,dsCMatrix,logical-method}
10    \alias{t,dsCMatrix-method}
11    \alias{t,dsTMatrix-method}
12    \alias{coerce,dsCMatrix,dgTMatrix-method}
13    \alias{coerce,dsCMatrix,dsTMatrix-method}
14    \alias{coerce,dsCMatrix,dsyMatrix-method}
15    \alias{coerce,dsCMatrix,dgeMatrix-method}
16    \alias{coerce,dsCMatrix,matrix-method}
17    \alias{coerce,dsCMatrix,lsCMatrix-method}
18    \alias{coerce,dsTMatrix,matrix-method}
19    \alias{coerce,dsTMatrix,dgeMatrix-method}
20    \alias{coerce,dsTMatrix,dsCMatrix-method}
21    \alias{coerce,dsTMatrix,dsyMatrix-method}
22    \alias{coerce,graphNEL,dsCMatrix-method}
23    \alias{determinant,dsCMatrix,missing-method}
24    \alias{determinant,dsCMatrix,logical-method}
25    \description{The \code{dsCMatrix} class is a class of symmetric, sparse
26    matrices in the compressed, column-oriented format.  In this    matrices in the compressed, column-oriented format.  In this
27    implementation the non-zero elements in the columns are sorted into    implementation the non-zero elements in the columns are sorted into
28    increasing row order.}    increasing row order. The \code{dsTMatrix} class is a class of
29      symmetric, sparse matrices in triplet format.}
30  \section{Objects from the Class}{  \section{Objects from the Class}{
31    Objects can be created by calls of the form \code{new("sscMatrix", ...)}.    Objects can be created by calls of the form \code{new("dsCMatrix",
32        ...)} or \code{new("dsTMatrix", ...)}
33  }  }
34  \section{Slots}{  \section{Slots}{
35    \describe{    \describe{
# Line 26  Line 39 
39        triangle form is allowed.}        triangle form is allowed.}
40      \item{\code{p}:}{Object of class \code{"integer"} of pointers, one      \item{\code{p}:}{Object of class \code{"integer"} of pointers, one
41        for each column, to the initial (zero-based) index of elements in        for each column, to the initial (zero-based) index of elements in
42        the column.}        the column. (Only present in the \code{dsCMatrix} class.)}
43      \item{\code{i}:}{Object of class \code{"integer"} of length nnzero      \item{\code{i}:}{Object of class \code{"integer"} of length nnzero
44        (number of non-zero elements).  These are the row numbers for        (number of non-zero elements).  These are the row numbers for
45        each non-zero element in the matrix.}        each non-zero element in the matrix.}
46        \item{\code{j}:}{Object of class \code{"integer"} of length nnzero
47          (number of non-zero elements).  These are the column numbers for
48          each non-zero element in the matrix. (Only present in the
49          \code{dsTMatrix} class.)}
50      \item{\code{x}:}{Object of class \code{"numeric"} - the non-zero      \item{\code{x}:}{Object of class \code{"numeric"} - the non-zero
51        elements of the matrix.}        elements of the matrix.}
52      \item{\code{factors}:}{Object of class \code{"list"} - a list      \item{\code{factors}:}{Object of class \code{"list"} - a list
# Line 40  Line 57 
57    }    }
58  }  }
59  \section{Extends}{  \section{Extends}{
60  Class \code{"cscMatrix"}, directly.  Class \code{"dgCMatrix"}, directly.
61  }  }
62  \section{Methods}{  \section{Methods}{
63    \describe{    \describe{
64      \item{solve}{\code{signature(a = "sscMatrix", b = "matrix")}: Solve      \item{solve}{\code{signature(a = "dsCMatrix", b = "matrix")}: Solve
65        a linear system of equations defined by \code{x} using a Cholesky        a linear system of equations defined by \code{x} using a Cholesky
66        decomposition.}        decomposition.}
67      \item{chol}{\code{signature(x = "sscMatrix", pivot = "logical")}:      \item{chol}{\code{signature(x = "dsCMatrix", pivot = "logical")}:
68        Returns (and stores) the Cholesky decomposition of the matrix        Returns (and stores) the Cholesky decomposition of the matrix
69        \code{x}. If \code{pivot} is \code{TRUE} (the default) Metis is        \code{x}. If \code{pivot} is \code{TRUE} (the default) Metis is
70        used to create a reordering of the rows and columns of \code{x} so        used to create a reordering of the rows and columns of \code{x} so
71        as to minimize fill-in.}        as to minimize fill-in.}
72      \item{determinant}{\code{signature(x = "sscMatrix", logarithm =      \item{determinant}{\code{signature(x = "dsCMatrix", logarithm =
73          "missing")}: Evaluate the determinant of \code{x} on the          "missing")}: Evaluate the determinant of \code{x} on the
74        logarithm scale.  This creates and stores the Cholesky factorization.}        logarithm scale.  This creates and stores the Cholesky factorization.}
75      \item{determinant}{\code{signature(x = "sscMatrix", logarithm =      \item{determinant}{\code{signature(x = "dsCMatrix", logarithm =
76          "logical")}: Evaluate the determinant of \code{x} on the          "logical")}: Evaluate the determinant of \code{x} on the
77        logarithm scale or not, according to the \code{logarithm}        logarithm scale or not, according to the \code{logarithm}
78        argument.  This creates and stores the Cholesky factorization.}        argument.  This creates and stores the Cholesky factorization.}
79      \item{coerce}{\code{signature(from = "sscMatrix", to = "tripletMatrix")}}      \item{t}{\code{signature(x = "dsCMatrix")}: Transpose.  Because
80      \item{coerce}{\code{signature(from = "sscMatrix", to = "geMatrix")}}        \code{x} is symmetric this has no effect.}
81      \item{coerce}{\code{signature(from = "sscMatrix", to = "matrix")}}      \item{t}{\code{signature(x = "dsTMatrix")}: Transpose.  For the
82          \code{dsTMatrix} class the row and column indices are interchanged
83          so that a matrix for which the upper triangle is stored produces a
84          matrix for which the lower triangle is stored and vice versa.}
85        \item{coerce}{\code{signature(from = "dsCMatrix", to = "dgTMatrix")}}
86        \item{coerce}{\code{signature(from = "dsCMatrix", to = "dgeMatrix")}}
87        \item{coerce}{\code{signature(from = "dsCMatrix", to = "matrix")}}
88        \item{coerce}{\code{signature(from = "dsTMatrix", to = "dgeMatrix")}}
89        \item{coerce}{\code{signature(from = "dsTMatrix", to = "dsCMatrix")}}
90        \item{coerce}{\code{signature(from = "dsTMatrix", to = "dsyMatrix")}}
91        \item{coerce}{\code{signature(from = "dsTMatrix", to = "matrix")}}
92    }    }
93  }  }
94  %\references{}  %\references{}
95  %\author{}  %\author{}
96  %\note{}  %\note{}
97  \seealso{  \seealso{
98    \code{\link{cscMatrix-class}}, \code{\link{tripletMatrix-class}},    \code{\link{dgCMatrix-class}}, \code{\link{dgTMatrix-class}},
99    \code{\link{geMatrix-class}}    \code{\link{dgeMatrix-class}}
100  }  }
101  %\examples{}  %\examples{}
102  \keyword{classes}  \keyword{classes}

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