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  which can either be supplied or default to the extremes of the
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  which can either be supplied or default to the extremes of the
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  data.
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  data.
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  A primary use is in modeling formula to directly specify a
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  A primary use is in modeling formula to directly specify a
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  natural spline term in a model: see the examples.
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  natural spline term in a model: see the examples.
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  Also, if the formula has a \code{subset = *} part, the \code{x} in
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  \code{ns(x)} is evaluated before subsetting which may lead to unexpected
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  results.  For more information see the \sQuote{Details} section of the
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  \code{\link{model.frame}}.
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}
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}
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\value{
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\value{
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  A matrix of dimension \code{length(x) * df} where either \code{df} was
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  A matrix of dimension \code{length(x) * df} where either \code{df} was
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  supplied or if \code{knots} were supplied,
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  supplied or if \code{knots} were supplied,
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  \code{df = length(knots) + 1 + intercept}.
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  \code{df = length(knots) + 1 + intercept}.
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  Attributes are returned that correspond to the arguments to \code{ns},
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  Attributes are returned that correspond to the arguments to \code{ns},