Greetings,
In my opinion the documentation or behaviour of qr.solve, qr.coef, qr.resid,
and qr.fitted is not easily comprehensible and unfortunate.
We all know that a linear system Ax=b can have 0, one or infinitely many
solutions. To treat all these cases uniformly we can rephrase the
Greetings,
Running R 3.5.0 under Windows 7
typeof(c(1,"2")) yields "character" as expected. But in
d.f <- data.frame(C=c(1,"2"))
typeof(d.f$C) yields "integer".
Is this a bug?
Michael Meyer
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