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ones(A)

ones(A)

Create an array of all ones with the same element type and shape as A.

Examples

1. Create a 1D array of ones:

   julia> ones(5)
   5-element Array{Float64,1}:
   1.0
   1.0
   1.0
   1.0
   1.0

   This example creates a 1-dimensional array of type Float64 with all elements set to 1.

2. Create a 2D array of ones:

   julia> ones(Int, 3, 2)
   3×2 Array{Int64,2}:
   1  1
   1  1
   1  1

   It creates a 2-dimensional array of type Int64 with dimensions 3x2, where all elements are set to 1.

3. Create a 3D array of ones:

   julia> ones(Float32, (2, 2, 2))
   2×2×2 Array{Float32,3}:
   [:, :, 1] =
   1.0  1.0
   1.0  1.0
   
   [:, :, 2] =
   1.0  1.0
   1.0  1.0

   This example generates a 3-dimensional array of type Float32 with dimensions 2x2x2, where all elements are set to 1.

Common mistake example:

julia> ones(5, 5, 5)
ERROR: MethodError: no method matching ones(::Int64, ::Int64, ::Int64)

In this example, the ones function is called with three integer arguments, expecting to create a 3-dimensional array. However, the correct syntax is to pass a type as the first argument and the dimensions as subsequent arguments or as a tuple.

See Also

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