logical indexes (which) {extraoperators}

Several ways to return an index based on logical range comparison helpers

Description

Several ways to return an index based on logical range comparison helpers

Usage

e1 %?gele% e2

e1 %?gel% e2

e1 %?gle% e2

e1 %?gl% e2

e1 %?ge% e2

e1 %?g% e2

e1 %?le% e2

e1 %?l% e2

e1 %?in% e2

e1 %?!in% e2

e1 %?nin% e2

e1 %?==% e2

e1 %?!=% e2

e1 %?c% e2

e1 %?e% e2

e1 %?grepl% e2

e1 %?!grepl% e2

Arguments

e1

A number of vector to be evaluated and for which the indices will be returned

e2

A vector of one or two numbers used to denote the limits for logical comparison.

Value

A vector of the indices identifying which values of e1 meet the logical conditions.

Examples

1:5 %?gele% c(2, 4)
1:5 %?gele% c(4, 2) # order does not matter uses min / max

1:5 %?gel% c(2, 4)
1:5 %?gel% c(4, 2) # order does not matter uses min / max

1:5 %?gle% c(2, 4)
1:5 %?gle% c(4, 2) # order does not matter uses min / max

1:5 %?gl% c(2, 4)
1:5 %?gl% c(4, 2) # order does not matter uses min / max

1:5 %?ge% 2
1:5 %?ge% 4

1:5 %?g% 2
1:5 %?g% 4

1:5 %?le% 2
1:5 %?le% 4

1:5 %?l% 2
1:5 %?l% 4

1:5 %?in% c(2, 99)
c("jack", "jill", "john", "jane") %?in% c("jill", "jane", "bill")

1:5 %?!in% c(2, 99)
c("jack", "jill", "john", "jane") %?!in% c("jill", "jane", "bill")

1:5 %?nin% c(2, 99)
c("jack", "jill", "john", "jane") %snin% c("jill", "jane", "bill")

11:15 %?==% c(11, 1, 13, 15, 15)

11:15 %?!=% c(11, 1, 13, 15, 15)
## define a variable
sample_data <- c(1, 3, 9, 5, NA, -9)

## suppose that we expect that values should fall in [1, 10]
## unless they are special character, -9 used for unknown / refused
sample_data %?c% "( >= 1 & <= 10 ) | == -9"

## we might expect some missing values and be OK as long as
## above conditions are met or values are missing
sample_data %?c% "( >= 1 & <= 10 ) | == -9 | is.na"

## equally we might be expecting NO missing values
## and want missing values to come up as FALSE
sample_data %?c% "(( >= 1 & <= 10 ) | == -9) & !is.na"

## clean up
rm(sample_data)
## define a variable
sample_data <- c(1, 3, 9, 5, -9)

sample_data %?e% "(-8, 1] | [2, 9)"

## clean up
rm(sample_data)

c("jack", "jill", "john", "jane", "sill", "ajay") %?grepl% "ja"
c("jack", "jill", "john", "jane", "sill", "ajay") %?grepl% "^ja"

c("jack", "jill", "john", "jane", "sill", "ajay") %?!grepl% "ja"
c("jack", "jill", "john", "jane", "sill", "ajay") %?!grepl% "^ja"