Extract function

Extraction and replacement methods for class "frab"

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

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

Methods

• [: signature(x = "frab", i = "character", j = "missing"): x["a"] <- 33
• [: signature(x = "frab", i = "disord", j = "missing"): x[x>3]
• [: signature(x = "frab", i = "missing", j = "missing"): x[]
• [<-: signature(x = "frab", i = "character",j = "missing", value = "ANY"): x["a"] <- 3
• [<-: signature(x = "frab", i = "disord", j = "missing", value="frab"): x[x<0] <- -x[x<0]; not implemented
• [<-: signature(x = "frab", i = "disord", j = "missing", value="logical"): x[x<0] <- NA
• [<-: signature(x = "frab", i = "ANY",j = "ANY", value = "ANY"): not implemented
• [<-: signature(x = "frab", i = "disindex",j = "missing", value = "numeric"): x[x>0] <- 3
• [<-: signature(x = "frab", i = "character", j = "missing", value ="logical"): x["c"] <- NA

Double square extraction, as in x[[i]] and x[[i]] <- value, is not currently defined. In replacement methods, if value is logical it is coerced to numeric (this includes NA).

Special dispensation is given for extraction of a frab with a length zero index, as in x[NULL], which returns the empty frab object.

Author(s)

Robin K. S. Hankin

Returns

Generally, return a frab object.

Examples

frab(setNames(seq_len(0),letters[seq_len(0)]))

a <- rfrab(26,sym=letters)
a<4
a[a<4]
a[a<4] <- 100
a

x <- rfrab()
values(x) <- values(x) + 66

x <- rfrabb()
v <-  values(x)
v[v<0] <- abs(v[v<0]) + 50
values(x) <- v

names(x) <- toupper(names(x))
x