From here I found that in a range construct one cannot find and replace its elements via array functions... How can be do it anyway?
Suppose I want to delete the elements 2,6,7,8,13,19 in range(1, step=1, stop=21). Or more generally, suppose a is a random array that contains numbers in the range [1,21] and one wants to delete these elementes in the given range.
You cannot delete from a range object, since that is immutable, but you can filter it:
julia> filter(x -> x ∉ [2,6,7,8,13,19], a)
15-element Array{Int64,1}:
1
3
4
5
9
10
11
12
14
15
16
17
18
20
21
However, if a is a "real" array, you can use filter! to operate in-place.
Another solution that if often convenient is to use InvertedIndices.jl package which exports Not and you can just use indexing:
julia> r = 1:21
1:21
julia> x = [2,6,7,8,13,19]
6-element Array{Int64,1}:
2
6
7
8
13
19
julia> r[Not(x)]
15-element Array{Int64,1}:
1
3
4
5
9
10
11
12
14
15
16
17
18
20
21