CODEWITHSUNDEEP
rsyntax
mql4beginner
mql4beginner

Reputation: 2233

r syntax: purpose of `[1]`

I found this code on :http://onertipaday.blogspot.co.il/search/label/descriptive%20statistic The code is describing a workaround for finding the min and max in a dataset that has inf and -inf in a vector. However I don't understand the purpose of the [1] and [2] in the last two lines of code.

data <- c(-Inf, 1,2,3,4,5,6,7,8,9,10, Inf)
max(data)
# Return Inf
min(data)
# Return -Inf
# To solve the problem I went to:
range(data, finite=TRUE)
# Then you can do
myMinimum <- range(data, finite=TRUE)[1]
myMaximum <- range(data, finite=TRUE)[2]

Upvotes: 0

Views: 62

Answers (1)

nico
nico

Reputation: 51640

The range function returns a vector of length 2, with the first being the minimum and the second being the maximum.

For instance:

> a <- 15:30
> range(a)
[1] 15 30

Using the [] operator you extract the desired element

 > range(a)[1]
 [1] 15
 > range(a)[2]
 [1] 30

Or you can also do:

 r <- range(a)
 my.min <- r[1]
 my.max <- r[2]

For more information read ?range.

Also, you can directly use the min and max functions.

Upvotes: 1

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