> matrix(1)[[1,]]
Error in matrix(1)[[1, ]] : invalid subscript type 'symbol'
This is of course an incorrect use of [[, but I think the error
message could be more helpful.
I will guess that it is interpreting the missing value indicator as a
symbol, since I get the same error message for
> matrix(1)[[ quote(a=), ]]
-s
PS quote(a=) seems to be the easiest way to get the missing value
indicator as a value. Is it by design that it returns the MVI? Or is
it a missing error check?
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