setindex!(A::AbstractArray,X,inds...)

setindex!(A, X, inds...)

Store values from array X within some subset of A as specified by inds.

Examples

julia> foo = [-1, -2, -3];
julia> setindex!(foo, 2, 2)
3-element Array{Int64,1}:
-1
2
-3

julia> bar = zeros(2, 2);           # 2x2 array of zeros
julia> setindex!(bar, 42, 2, 1)
2x2 Array{Float64,2}:
0.0   0.0
42.0  0.0

In the Julia programming language, the function setindex!(collection, value, key...)

Store the given value at the given key or index within a collection. The syntax a[i,j,...] = x is converted by the compiler to (setindex!(a, x, i, j, ...); x).

julia> arr = [1, 2, 3, 4, 5];
julia> setindex!(arr, 10, 3)
5-element Array{Int64,1}:
  1
  2
 10
  4
  5

Set value at a specific index:

julia> arr = [1, 2, 3, 4, 5];
julia> setindex!(arr, 10, 3)
5-element Array{Int64,1}:
1
2
10
4
5

This example sets the value 10 at index 3 in the array arr.

Modify a dictionary:

julia> dict = Dict("apple" => 10, "banana" => 20, "orange" => 30);
julia> setindex!(dict, 25, "banana")
Dict{String,Int64} with 3 entries:
"apple"  => 10
"banana" => 25
"orange" => 30

It sets the value 25 for the key "banana" in the dictionary dict.

Set value at multiple indices:

julia> arr = [1, 2, 3, 4, 5];
julia> setindex!(arr, 0, 2, 4)
5-element Array{Int64,1}:
1
0
3
0
5

This example sets the value 0 at indices 2 and 4 in the array arr.

Common mistake example:

julia> arr = [1, 2, 3, 4, 5];
julia> setindex!(arr, 10, 6)
ERROR: BoundsError: attempt to access 5-element Array{Int64,1} at index [6]

In this example, the index provided is out of bounds for the array. Ensure that the index is within the valid range of the collection to avoid such errors.

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setindex!(A::AbstractArray,X,inds...)

Examples

See Also

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