[R] Problem with new(er) R version's matrix package

David Winsemius dwinsemius at comcast.net
Fri Apr 25 20:15:25 CEST 2014

On Apr 25, 2014, at 9:17 AM, Werner W. wrote:

> Dear Rs,
> I am re-executing some older code. It does work in the ancient R 2.12.0 which I still have on my PC but with the new version R 3.1.0 it does not work any more (but some other new stuff, which won't work with 2.12).
> The problem arises in context with the systemfit package using the matrix package. In R 3.1.0 the following error is thrown:
> Error in as.matrix(solve(W, tol = solvetol)[1:ncol(xMat), 1:ncol(xMat)]) : error in evaluating the argument 'x' in selecting a method for function 'as.matrix': Error in .solve.sparse.dgC(as(a, "dgCMatrix"), b = b, tol = tol) : LU computationally singular: ratio of extreme entries in |diag(U)| = 7.012e-39
> However, I have no clue what I can do about this. Was there some change in the defaults of the matrix package? I couldn't find anything apparent in the changelog. As the same code works in R 2.12.0, I suppose that the problem is not my data.

You have not told us what version of the Matrix package you were using. As such I would suggest that you review the Changelog which is a link for the CRAN page for pkg:Matrix and go back 4 years or so since R major versions change about once a year.


> If anyone has an idea about this, I would really appreciate your hints.
> Thanks!
> Werner
> 	[[alternative HTML version deleted]]
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David Winsemius
Alameda, CA, USA

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