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| = Julia Arrays = Julia supports '''single-''' and '''multi-dimensional arrays'''. <<TableOfContents>> ---- == Declaration == A single-dimensional array is called a '''vector'''. {{{ julia> [1,2,3] 3-element Vector{Int64}: 1 2 3 }}} Arrays take the common type of all their elements. If the elements are not of the same type but have a common [[Julia/DataTypes#Promotion|promotion type]], the elements are recast. {{{ julia> [1, 2.3, 4//5] 3-element Vector{Float64}: 1.0 2.3 0.8 }}} Elements can also be explicitly recast at declaration of an array. {{{ julia> Float32[1, 2.3, 4//5] 3-element Vector{Float32}: 1.0 2.3 0.8 }}} If elements are delimited by single semicolons (`;`) or newlines, they are '''vertically concatenated'''. This usually still results in a vector. {{{ julia> [1:2; 4:5] 4-element Vector{Int64}: 1 2 4 5 julia> [1:2 4:5 6] 5-element Vector{Int64}: 1 2 4 5 6 }}} If elements are delimited by tabs or spaces or double semicolons, they are '''horizontally concatenated'''. This usually creates a '''matrix''', a multi-dimensional array. {{{ julia> [1:2 4:5 7:8] 2×3 Matrix{Int64}: 1 4 7 2 5 8 julia> [1 2 3] 1×3 Matrix{Int64}: 1 2 3 }}} ---- CategoryRicottone |
