Displaying 5 results from an estimated 5 matches for "densematrix".
2006 Dec 19
1
preserving sparse matrices (Matrix)
Hi,
I have sparse (tridiagonal) matrices, and I use the Matrix package for
handling them. For certain computations, I need to either set the
first row to zero, or double the last row. I find that neither
operation preserves sparsity, eg
> m <- Diagonal(5)
> m
5 x 5 diagonal matrix of class "ddiMatrix"
[,1] [,2] [,3] [,4] [,5]
[1,] 1 . . . .
[2,] . 1
2016 Apr 20
0
Matrix: How create a _row-oriented_ sparse Matrix (=dgRMatrix)?
...to "dgRMatrix"
The general philosophy in 'Matrix' with all the class
hierarchies and the many specific classes has been to allow and
foster coercing to abstract super classes,
i.e, to "dMatrix" or "generalMatrix", "triangularMatrix", or
then "denseMatrix", "sparseMatrix", "CsparseMatrix" or
"RsparseMatrix", etc
So in the above as(*, "RsparseMatrix") should work always.
As a summary, in other words, for what you want,
as(sparseMatrix(.....), "RsparseMatrix")
should give you what you...
2016 Apr 19
2
Matrix: How create a _row-oriented_ sparse Matrix (=dgRMatrix)?
Using the Matrix package, how can I create a row-oriented sparse
Matrix from scratch populated with some data? By default a
column-oriented one is created and I'm aware of the note that the
package is optimized for column-oriented ones, but I'm only interested
in using it for holding my sparse row-oriented data and doing basic
subsetting by rows (even using drop=FALSE).
Here is what I
2006 Jul 24
1
conflict of package "Matrix" and summary of lme object
After loading the package "Matrix" (version 0.995-12), using the summary
function with an lme (package nlme version 3.1-75) object results in an
error message saying
Fehler in dim(x) : kein Slot des Namens "Dim" f?r dieses Objekt der
Klasse "correlation"
(translated: 'Error in dim(x) : no slot of the name "Dim" for this
object of class
2019 Mar 22
2
selectMethod() can fail to find methods in situations of multiple dispatch
Fine with me as long as eliminating the inconveniences associated with it can be put on the roadmap. The alias instability and the fact that the user has no way to know if s/he should do ?`foo,numeric-method` or ?`foo,numeric,ANY-method` to find the method has been a long-standing problem.
H.
On 3/21/19 21:29, Michael Lawrence wrote:
If we started over, I'd try to avoid this sort of