Description Usage Arguments Details Value Note Author(s) See Also Examples

Series of functions extending existing vector operations to lists of vectors.

1 | ```
setmatch(x, y, nomatch = NA_integer_)
``` |

`x` |
list of vectors. |

`y` |
list of vectors. |

`nomatch` |
value to be returned in the case when no match is found. Note that it is coerced to integer. |

`setmatch`

checks whether each vector in the list `x`

is also
contained in the list `y`

, and if so returns position of the first such
vector in `y`

. The ordering of the elements of the vector is
irrelevant, as they are considered to be sets.

`subsetmatch`

is similar to `setmatch`

, except vectors in `x`

are searched to see if they are subsets of vectors in `y`

.

`setsetdiff`

is a setwise version of `setdiff`

, and
`setsetequal`

a setwise version of `setequal`

.

`setmatch`

and `subsetmatch`

return a vector of integers
of length the same as the list `x`

.

`setsetdiff`

returns a sublist `x`

.

`setsetequal`

returns a logical of length 1.

These functions are not recursive, in the sense that they cannot be used to test lists of lists. They also do not reduce to the vector case.

Robin Evans

1 2 3 4 5 6 7 8 9 | ```
x = list(1:2, 1:3)
y = list(1:4, 1:3)
setmatch(x, y)
subsetmatch(x, y)
setsetdiff(x, y)
x = list(1:3, 1:2)
y = list(2:1, c(2,1,3))
setsetequal(x, y)
``` |

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