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\alias{stack.default}
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\alias{stack.default}
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\alias{stack.data.frame}
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\alias{stack.data.frame}
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\alias{unstack}
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\alias{unstack}
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\alias{unstack.default}
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\alias{unstack.default}
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\alias{unstack.data.frame}
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\alias{unstack.data.frame}
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\title{Stack or Unstack Vectors from a Data Frame or List}
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\title{Stack or \I{Unstack} Vectors from a Data Frame or List}
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\description{
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\description{
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  Stacking vectors concatenates multiple vectors into a single vector
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  Stacking vectors concatenates multiple vectors into a single vector
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  along with a factor indicating where each observation originated.
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  along with a factor indicating where each observation originated.
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  Unstacking reverses this operation.
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  \I{Unstacking} reverses this operation.
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}
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}
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\usage{
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\usage{
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stack(x, \dots)
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stack(x, \dots)
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\method{stack}{default}(x, drop=FALSE, \dots)
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\method{stack}{default}(x, drop=FALSE, \dots)
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\method{stack}{data.frame}(x, select, drop=FALSE, \dots)
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\method{stack}{data.frame}(x, select, drop=FALSE, \dots)