matrix() can't handle NaN (PR#193)

[maechler@stat.math.ethz.ch]

Bill argues that NaN should be treated as a number, 
even by read.table() and I think he is right.
{ scan(.) does fine !  it *does* treat NaN as numbers ! }

At the moment, I don't even see where the problem is;
the read.table internal function  type.convert()
does well with NaN's :
     > cc <- as.character(c(pi,NaN))
     > str(type.convert(cc))
      num [1:2] 3.14  NaN

Martin

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