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  between the x-axis and the vector from the origin to \eqn{(x,y)},
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  between the x-axis and the vector from the origin to \eqn{(x,y)},
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  i.e., for positive arguments \code{atan2(y,x) == atan(y/x)}.
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  i.e., for positive arguments \code{atan2(y,x) == atan(y/x)}.
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  Angles are in radians, not degrees (i.e., a right angle is
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  Angles are in radians, not degrees (i.e., a right angle is
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  \eqn{\pi/2}).
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  \eqn{\pi/2}).
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  All except \code{atan2} are generic functions: methods can be defined
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  for them individually or via the \code{\link{Math}} group generic.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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  Wadsworth \& Brooks/Cole.