w
[,1] [,2] [,3] [,4] 1:1 0.0 0.5 0.5 0.0 2:1 0.5 0.0 0.0 0.5 1:2 0.5 0.0 0.0 0.5 2:2 0.0 0.5 0.5 0.0
solve(w)
Error in solve.default(w) : Lapack routine dgesv: system is exactly singular what does the error mean?
solve error
2 messages · Robert, Dimitris Rizopoulos
it means that the matrix w is singular; check all.equal(w[, 1], w[, 4]) all.equal(w[, 2], w[, 3]) # or qr(w)$rank you need linearly independent columns! I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://www.med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Sam R. Smith" <samrobertsmith at yahoo.com> To: <r-help at stat.math.ethz.ch> Sent: Friday, October 28, 2005 9:06 AM Subject: [R] solve error
w
[,1] [,2] [,3] [,4] 1:1 0.0 0.5 0.5 0.0 2:1 0.5 0.0 0.0 0.5 1:2 0.5 0.0 0.0 0.5 2:2 0.0 0.5 0.5 0.0
solve(w)
Error in solve.default(w) : Lapack routine dgesv: system is exactly singular what does the error mean?
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