Description Usage Arguments Details Value Note Examples

Determine if an object is one- or two-sided.

Test whether a object (typically formula, call or expression) is one- (e.g.
`~x`

) or two-sided (e.g. `x~y`

).

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | ```
is.one.sided(x, ...)
## S4 method for signature 'formula'
is.one.sided(x, ...)
## S4 method for signature 'call'
is.one.sided(x, ...)
## S4 method for signature 'expression'
is.one.sided(x, ...)
## S4 method for signature 'list'
is.one.sided(x, ...)
## S4 method for signature 'ANY'
is.one.sided(x, ...)
is.two.sided(x, ...)
## S4 method for signature 'formula'
is.two.sided(x, ...)
## S4 method for signature 'call'
is.two.sided(x, ...)
## S4 method for signature 'expression'
is.two.sided(x, ...)
## S4 method for signature 'list'
is.two.sided(x, ...)
## S4 method for signature 'ANY'
is.two.sided(x, ...)
``` |

`x` |
object to test for one-sidedness. |

`...` |
arguments passed to called functions |

These functions detect whether the formula is single- (unary) or double- sided. They work on formulas, expression, calls, assignments, etc.

`is.single.sided`

and `is.unary`

are alias for
`is.single.sided`

. `is.double.sided`

and `is.binary`

are
aliases for `is.two.sided`

.

logical; whether `x`

is an object is one-sided or two-sided formula.

Methods for the "`<-`

" class exist and are not included in the usage
documentation because CRAN does not support S4 documentation for this class.

1 2 3 4 5 6 7 8 9 10 | ```
form <- y ~ x
is.one.sided(form)
# is.single.sided(form)
# is.unary(form)
is.two.sided(form)
# is.double.sided(form)
# is.binary(form)
``` |

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