disordR (version 0.9)

extract: Extraction and replacement methods for class "disord"

Description

The disord class provides basic arithmetic and extract/replace methods for disord objects.

Class index is taken from the excellent Matrix package and is a setClassUnion() of classes numeric, logical, and character.

Methods

[

signature(x = "disord", i = "ANY", j = "ANY"): ...

[

signature(x = "disord", i = "index", j = "index"): ...

[

signature(x = "disord", i = "index", j = "missing"): ...

[

signature(x = "disord", i = "missing", j = "index"): ...

[

signature(x = "disord", i = "missing", j = "missing"): ...

[

signature(x = "disord", i = "matrix", j = "missing"): ...

[<-

signature(x = "disord", i = "index", j = "index"): ...

[<-

signature(x = "disord", i = "index", j = "missing"): ...

[<-

signature(x = "disord", i = "missing", j = "index"): ...

[<-

signature(x = "disord", i = "matrix", j = "missing"): ...

[<-

signature(x = "disord", i = "missing", j = "missing"): ...

Arith

signature(e1 = "ANY", e2 = "disord"): ...

Arith

signature(e1 = "disord", e2 = "ANY"): ...

Arith

signature(e1 = "disord", e2 = "disord"): ...

Arith

signature(e1 = "disord", e2 = "missing"): ...

The extraction method takes a drop argument which if TRUE, returns the drop() of its value. Extraction, as in x[i], is rarely useful. It is only defined if one extracts either all, or none, of the elements: anything else is undefined. Note that the hash code is unchanged if all elements are extracted (because the order might have changed) but unchanged if none are (because there is only one way to extract no elements).

Author

Robin K. S. Hankin

See Also

drop

Examples

a <- disord(sample(9))
a
a + 6*a^2
a[a>5]  # "give me all elements of a that exceed 5"

a[] # a disord object, same elements as 'a', but with a different hash

a[a<5] <- a[a<5] + 100  # "replace all elements of 'a' less than 5 with their value plus 100"
a

## Following expressions would return an error if executed:
if(FALSE){
  a[1]
  a[1] <- 44
  a[1:2] <- a[3:4]
}

b <- disord(sample(9))
## Following expressions would also return an error if executed:
if(FALSE){
  a+b  # (not really an example of extraction)
  a[b>5]
  a[b>5] <- 100
  a[b>5] <- a[b>5] + 44
}