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broadcast_getindex

broadcast_getindex(A, inds...)

Broadcasts the inds arrays to a common size like broadcast, and returns an array of the results A[ks...], where ks goes over the positions in the broadcast.

Examples

julia> foo = [1 2];
julia> bar = [2; 1];
julia> baz = [8 9; 10 11]
2x2 Array{Int64,2}:
    8       9      
 10     11
julia> broadcast_getindex(baz, foo, bar)      
2x2 Array{Int64,2}:     
 9      11      
 8      10
julia> #    foo -> [1 2; 1 2];  bar -> [2 2;  1 1];
julia> #   [baz[1,2]  baz[2,2];    baz[1,1]   baz[2,1]]

1. Access multiple elements from an array:

   julia> arr = [10, 20, 30, 40, 50];
   julia> broadcast_getindex(arr, 1, 3, 5)
   (10, 30, 50)

   This example retrieves the elements at indices 1, 3, and 5 from the array arr using broadcast_getindex.

2. Access elements from multiple arrays:

   julia> arr1 = [1, 2, 3];
   julia> arr2 = [10, 20, 30];
   julia> broadcast_getindex(arr1, arr2, [2, 3])
   (2, 20, 3)

   It retrieves the elements from different arrays at specified indices.

3. Handle broadcasting with scalar indices:

   julia> arr = [1, 2, 3, 4, 5];
   julia> broadcast_getindex(arr, 2)
   2

   In this case, the scalar index 2 is used to retrieve a single element from the array.

Common mistake example:

julia> arr = [1, 2, 3];
julia> broadcast_getindex(arr, [1, 2, 3, 4])
ERROR: DimensionMismatch: ...

In this example, the dimensions of the inds array do not match the dimensions of the original array arr. It's important to ensure that the dimensions are compatible for broadcasting to avoid DimensionMismatch errors.

See Also

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