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[matrix] Diff of /pkg/man/dCholCMatrix-class.Rd
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Diff of /pkg/man/dCholCMatrix-class.Rd

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revision 489, Wed Feb 2 19:12:03 2005 UTC revision 505, Fri Feb 4 18:18:48 2005 UTC
# Line 1  Line 1 
1  \name{dCholCMatrix-class}  \name{dCholCMatrix-class}
2  \docType{class}  \docType{class}
3  \alias{dCholCMatrix-class}  \alias{dCholCMatrix-class}
4  \title{Cholesky decompositions of dsCMatrix objects}  \title{Cholesky Decompositions of dsCMatrix Objects}
5  \description{The class of Cholesky decompositions of symmetric, sparse  \description{The class of Cholesky decompositions of symmetric, sparse
6    column matrices from the \code{"dsCMatrix"} class.}    compressed column matrices from the \code{"dsCMatrix"} class.}
7  \section{Objects from the Class}{  \section{Objects from the Class}{
8  Objects can be created by calls of the form \code{new("dCholCMatrix", ...)}  Objects can be created by calls of the form \code{new("dCholCMatrix", ...)}
9  but are more commonly created from \code{chol} applied to an  but are more commonly created from \code{chol} applied to an
# Line 57  Line 57 
57  %\examples{}  %\examples{}
58  \examples{  \examples{
59  data(mm)  data(mm)
60  xpx = crossprod(mm)  xpx <- crossprod(mm)
61  str(xpx)  str(xpx)
62  str(chol(xpx))  str(ch <- chol(xpx))
63    
64    ## Visualize the sparseness:
65    image(xpx, main=paste("crossprod(mm) : Sparse",dQuote(class(xpx))))
66    image(ch, main=paste("chol (crossprod(mm)) : Sparse", dQuote(class(ch))))
67  }  }
68  \keyword{classes}  \keyword{classes}
69  \keyword{algebra}  \keyword{algebra}

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