Iterating over each index of array in Julia – eachindex() Method

The eachindex() is an inbuilt function in julia which is used to create an iterable object for visiting each index of the specified array.

Syntax:
eachindex(A…)

Parameters:

• A: Specified array.

Returns: It returns an iterable object for visiting each index of the specified array.

Example 1:

# Julia program to illustrate
# the use of Array eachindex() method

# Accessing each index of 1D array
A = [1, 2, 3, 4];

# linear indexing
for i in eachindex(A)
    println(i)
end

# Accessing each index of 2D array
B = [2 4; 6 8];

# linear indexing
for i in eachindex(B)
    println(i)
end

# Accessing each index of 3D array
C = cat([1 2; 3 4], [5 6; 7 8], [2 2; 3 4], dims = 3);

# linear indexing
for i in eachindex(C)
    println(i)
end

Output:

Example 2:

# Julia program to illustrate
# the use of Array eachindex() method

# Accessing each index of 1D array
A = [1, 2, 3, 4];

# Cartesian indexing
for i in eachindex(view(A, 1:2, 1:1))
    println(i)
end

# Accessing each index of 2D array
B = [2 4; 6 8];

# Cartesian indexing
for i in eachindex(view(B, :, 1))
    println(i)
end

# Accessing each index of 3D array
C = cat([1 2; 3 4], [5 6; 7 8], [2 2; 3 4], dims = 3);

# Cartesian indexing
for i in eachindex(view(C, :, :, 1))
    println(i)
end

Output: