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% File src/library/base/man/expression.Rd
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% File src/library/base/man/expression.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2010 R Core Team
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% Copyright 1995-2018 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{expression}
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\name{expression}
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\alias{expression}
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\alias{expression}
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\alias{is.expression}
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\alias{is.expression}
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\examples{
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\examples{
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length(ex1 <- expression(1 + 0:9)) # 1
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length(ex1 <- expression(1 + 0:9)) # 1
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ex1
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ex1
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eval(ex1) # 1:10
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eval(ex1) # 1:10
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length(ex3 <- expression(u, v, 1+ 0:9)) # 3
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length(ex3 <- expression(u, 2, u + 0:9)) # 3
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mode(ex3 [3])   # expression
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mode(ex3 [3])   # expression
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mode(ex3[[3]])  # call
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mode(ex3[[3]])  # call
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## but not all components are 'call's :
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sapply(ex3, mode  ) #  name  numeric  call
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sapply(ex3, typeof) # symbol  double  language
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rm(ex3)
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rm(ex3)
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}
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}
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\keyword{programming}
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\keyword{programming}
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\keyword{dplot}
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\keyword{dplot}