[Rd] Determinant function (PR#9715)

krys at maths.lth.se krys at maths.lth.se
Fri Jun 1 17:03:26 CEST 2007

Full_Name: Krzysztof Podgorski
Version: R version 2.4.1 (2006-12-18)
OS: Windows XP
Submission from: (NULL) (

The function ''det'' works improperly for a singular matrix and returns a
non-zero value even if ''solve'' reports singularity. The matrix is very simple
as shown below.

A <- diag(rep(c(64,8), c(8,8)))
A[9:16,1] <- 8
A[1,9:16] <- 8

#[1] -196608
#Error in solve.default(A) : system is computationally singular: reciprocal
condition number = 2.31296e-18

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