CODEWITHSUNDEEP
rjulia
xiaodai
xiaodai

Reputation: 16064

What is Julia's equivalent of R's which?

In Rb given a vector x one can find the indices where its elements are TRUE using the which function. E.g. y = 1:100 and which(is.even(y)) should return 2,4,...,100

There are also which.max and which.min which returns the indices of minimum and maximum values respectiely.

What are their equivalents in Julia?

Upvotes: 13

Views: 3453

Answers (3)

fc9.30
fc9.30

Reputation: 2591

The equivalent of R's which is Julia's findall:

y = [1, 2, 3, 4] 
findall(y .> 2)

Upvotes: 4

xiaodai
xiaodai

Reputation: 16064

There is no exact equivalent but findall

There is a comparison list of vocabularies for Julia vs R; which is on the list

http://www.johnmyleswhite.com/notebook/2012/04/09/comparing-julia-and-rs-vocabularies/

However, according to the list Julia's find is equivalent to R's which as answered by others.

Upvotes: 5

rsaavedra
rsaavedra

Reputation: 134

The find function does that.

In R:

y = c(1,2,3,4)    
which(y > 2)

In Julia:

y = [1, 2, 3, 4]    
find(y .> 2)

Upvotes: 10

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