extract {IntervalQuestionStat}

Extract and replace parts of an interval-valued object

Description

This command allows to extract and replace parts of interval-valued lists or matrices.

Usage

## S4 method for signature 'IntervalList'
x[i]

## S4 method for signature 'IntervalList'
x[[i]]

## S4 method for signature 'IntervalMatrix'
x[i, j]

## S4 replacement method for signature 'IntervalList'
x[i] <- value

## S4 replacement method for signature 'IntervalList'
x[[i]] <- value

## S4 replacement method for signature 'IntervalMatrix'
x[i, j] <- value

Arguments

x

A list with several nonempty compact intervals or a matrix of intervals of this family, that is, an IntervalList object or an IntervalMatrix instance.

i

The indices of the elements of the list or the rows of the elements of the matrix wanted to be extracted saved as a numeric, integer, or logical object.

value

A single nonempty compact interval or a list or matrix of intervals saved of this family stored as an IntervalData, IntervalList, or IntervalMatrix object.

j

The indices of the columns of the matrix's elements wanted to be selected and extracted saved as a numeric, integer, or logical object.

Details

Both i and j can also be negative integers, indicating the elements lo leave out of the selection.

Value

It should be remarked that, on the one hand, the [ command returns the selected elements as a list of intervals, that is, an IntervalList object, when it is used for IntervalList instances. On the other hand, it returns IntervalData, IntervalList, or IntervalMatrix objects when it is used with IntervalMatrix instances. The [[ command allows to extract a single interval, that is, an IntervalData object, from a list of several intervals saved as an IntervalList object. Finally, both [<- and [[<- commands allow to replace the selected elements of the given interval-valued object by another object of the required class and, thus, they do not return any value.

Author(s)

José García-García [e-mail]

Examples

## Extract parts of a list of intervals
list <- IntervalList(c(1, 3, 5), c(2, 4, 6))
list[1]        ## Extract the first interval
               ## Note that the output is an IntervalList object
list[[1]]      ## The first interval is extracted as an IntervalData object
list[c(1, 3)]  ## Extract the first and the third interval

## Extract parts of a matrix of intervals
m <- IntervalMatrix(matrix(c(1, 5, 2, 6, 6, 2, 7, 3, 3, 4, 4, 5), 2, 6))
m[1, 1]        ## Extract the interval from the first row and first column
m[1,]          ## Extract all the intervals from the first row
m[, 1]         ## Extract all the intervals from the first column
m[, c(1, 3)]   ## Extract the sub-matrix containing all the intervals
               ## from both first and third column of the original matrix
               
## Replace parts of a list of intervals
list[[1]]
list[[1]] <- IntervalData(0, 1)
list[[1]]

list[c(1, 3)]
list[c(1, 3)] <- IntervalList(c(0, 1), c(1, 2))
list[c(1, 3)]

## Replace parts of a matrix of intervals
m[1, 1]
m[1, 1] <- IntervalData(0, 1)
m[1, 1]

m[1, 1:2]
m[1, 1:2] <- IntervalList(c(0, 1), c(1, 2))
m[1, 1:2]

m[, c(1, 3)]
m[, c(1, 3)] <- IntervalMatrix(matrix(1:8, 2, 4))
m[, c(1, 3)]