[Rd] Unexpected behaviour of base::qr()$rank

Bernd Funovits bernd.funovits at helsinki.fi
Thu Jun 22 17:11:49 CEST 2017


I experienced some unexpected behaviour while determining the rank of 
matrices (sometimes 1x1 matrices):
base::qr(matrix(1e-20))$rank returns 1 (incorrect)
base::qr(diag(c(1, 1e-20)))$rank returns 2 (incorrect)

Best regards,

 > R.version
platform       x86_64-w64-mingw32
arch           x86_64
os             mingw32
system         x86_64, mingw32
major          3
minor          4.0
year           2017
month          04
day            21
svn rev        72570
language       R
version.string R version 3.4.0 (2017-04-21)
nickname       You Stupid Darkness

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