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

[Arne Henningsen]

On 25 April 2014 20:15, David Winsemius <dwinsemius at comcast.net> wrote:
>
> 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.
>
> http://cran.r-project.org/web/packages/Matrix/ChangeLog

In addition, please provide a minimal, self-contained, reproducible example.

Best,
Arne

-- 
Arne Henningsen
http://www.arne-henningsen.name