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  but if \code{a} is a rectangular matrix the QR decomposition is
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  but if \code{a} is a rectangular matrix the QR decomposition is
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  computed first.  Either will handle over- and under-determined
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  computed first.  Either will handle over- and under-determined
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  systems, providing a least-squares fit if appropriate.
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  systems, providing a least-squares fit if appropriate.
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  \code{is.qr} returns \code{TRUE} if \code{x} is a \code{\link{list}}
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  \code{is.qr} returns \code{TRUE} if \code{x} is a \code{\link{list}}
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  with components named \code{qr}, \code{rank} and \code{qraux} and
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  and \code{\link{inherits}} from \code{"qr"}.% not more checks, for speed.
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  \code{FALSE} otherwise.
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  It is not possible to coerce objects to mode \code{"qr"}.  Objects
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  It is not possible to coerce objects to mode \code{"qr"}.  Objects
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  either are QR decompositions or they are not.
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  either are QR decompositions or they are not.
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  The LINPACK interface is restricted to matrices \code{x} with less
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  The LINPACK interface is restricted to matrices \code{x} with less