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A class may inherit all the slots and methods of one or more existing
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A class may inherit all the slots and methods of one or more existing
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classes by specifying the names of the inherited classes in the \code{contains =} argument to
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classes by specifying the names of the inherited classes in the \code{contains =} argument to
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\code{\link{setClass}()}.
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\code{\link{setClass}()}.
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To define a class that extends the \code{"Pos"} to a class
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To define a class that extends class \code{"Pos"} to a class
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\code{"GPS"} with a slot for the observation times:
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\code{"GPS"} with a slot for the observation times:
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\code{GPS <- setClass("GPS", slots = c(time = "POSIXt"), contains = "Pos")}
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\code{GPS <- setClass("GPS", slots = c(time = "POSIXt"), contains = "Pos")}
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The inherited classes may be S4 classes, S3
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The inherited classes may be S4 classes, S3