newline sensitive interpretation of Arrays












1














When I add a newline to my array definition, the type of my array changes.



julia> a = [[1]]
1-element Array{Array{Int64,1},1}:
[1]

julia> a = [[1]

]
1-element Array{Int64,1}:
1


I thought they both should return the same result i.e. of type Array{Array{Int64,1},1}










share|improve this question



























    1














    When I add a newline to my array definition, the type of my array changes.



    julia> a = [[1]]
    1-element Array{Array{Int64,1},1}:
    [1]

    julia> a = [[1]

    ]
    1-element Array{Int64,1}:
    1


    I thought they both should return the same result i.e. of type Array{Array{Int64,1},1}










    share|improve this question

























      1












      1








      1







      When I add a newline to my array definition, the type of my array changes.



      julia> a = [[1]]
      1-element Array{Array{Int64,1},1}:
      [1]

      julia> a = [[1]

      ]
      1-element Array{Int64,1}:
      1


      I thought they both should return the same result i.e. of type Array{Array{Int64,1},1}










      share|improve this question













      When I add a newline to my array definition, the type of my array changes.



      julia> a = [[1]]
      1-element Array{Array{Int64,1},1}:
      [1]

      julia> a = [[1]

      ]
      1-element Array{Int64,1}:
      1


      I thought they both should return the same result i.e. of type Array{Array{Int64,1},1}







      julia-lang






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 19 at 22:30









      RAbraham

      2,51222543




      2,51222543
























          1 Answer
          1






          active

          oldest

          votes


















          2














          In order to understand this see the following:



          julia> :([[1]

          ])
          :([[1];])


          And you see that adding a newline is rewritten as vcat operation.



          The reason for this is to allow writing something like this:



          julia> x = [1 2
          3 4]
          2×2 Array{Int64,2}:
          1 2
          3 4


          and your example is hitting a corner case of this syntax.



          Note, however, that without an extra empty line vcat is not called:



          julia> :([[1]
          ])
          :([[1]])


          Another use-case that is worth to know is:



          julia> [[1, 2]
          [3, 4]]
          4-element Array{Int64,1}:
          1
          2
          3
          4


          and the same with variables (can improve code readability in some cases):



          julia> a = [1,2]
          2-element Array{Int64,1}:
          1
          2

          julia> b = [3, 4]
          2-element Array{Int64,1}:
          3
          4

          julia> [a
          b]
          4-element Array{Int64,1}:
          1
          2
          3
          4





          share|improve this answer























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            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            In order to understand this see the following:



            julia> :([[1]

            ])
            :([[1];])


            And you see that adding a newline is rewritten as vcat operation.



            The reason for this is to allow writing something like this:



            julia> x = [1 2
            3 4]
            2×2 Array{Int64,2}:
            1 2
            3 4


            and your example is hitting a corner case of this syntax.



            Note, however, that without an extra empty line vcat is not called:



            julia> :([[1]
            ])
            :([[1]])


            Another use-case that is worth to know is:



            julia> [[1, 2]
            [3, 4]]
            4-element Array{Int64,1}:
            1
            2
            3
            4


            and the same with variables (can improve code readability in some cases):



            julia> a = [1,2]
            2-element Array{Int64,1}:
            1
            2

            julia> b = [3, 4]
            2-element Array{Int64,1}:
            3
            4

            julia> [a
            b]
            4-element Array{Int64,1}:
            1
            2
            3
            4





            share|improve this answer




























              2














              In order to understand this see the following:



              julia> :([[1]

              ])
              :([[1];])


              And you see that adding a newline is rewritten as vcat operation.



              The reason for this is to allow writing something like this:



              julia> x = [1 2
              3 4]
              2×2 Array{Int64,2}:
              1 2
              3 4


              and your example is hitting a corner case of this syntax.



              Note, however, that without an extra empty line vcat is not called:



              julia> :([[1]
              ])
              :([[1]])


              Another use-case that is worth to know is:



              julia> [[1, 2]
              [3, 4]]
              4-element Array{Int64,1}:
              1
              2
              3
              4


              and the same with variables (can improve code readability in some cases):



              julia> a = [1,2]
              2-element Array{Int64,1}:
              1
              2

              julia> b = [3, 4]
              2-element Array{Int64,1}:
              3
              4

              julia> [a
              b]
              4-element Array{Int64,1}:
              1
              2
              3
              4





              share|improve this answer


























                2












                2








                2






                In order to understand this see the following:



                julia> :([[1]

                ])
                :([[1];])


                And you see that adding a newline is rewritten as vcat operation.



                The reason for this is to allow writing something like this:



                julia> x = [1 2
                3 4]
                2×2 Array{Int64,2}:
                1 2
                3 4


                and your example is hitting a corner case of this syntax.



                Note, however, that without an extra empty line vcat is not called:



                julia> :([[1]
                ])
                :([[1]])


                Another use-case that is worth to know is:



                julia> [[1, 2]
                [3, 4]]
                4-element Array{Int64,1}:
                1
                2
                3
                4


                and the same with variables (can improve code readability in some cases):



                julia> a = [1,2]
                2-element Array{Int64,1}:
                1
                2

                julia> b = [3, 4]
                2-element Array{Int64,1}:
                3
                4

                julia> [a
                b]
                4-element Array{Int64,1}:
                1
                2
                3
                4





                share|improve this answer














                In order to understand this see the following:



                julia> :([[1]

                ])
                :([[1];])


                And you see that adding a newline is rewritten as vcat operation.



                The reason for this is to allow writing something like this:



                julia> x = [1 2
                3 4]
                2×2 Array{Int64,2}:
                1 2
                3 4


                and your example is hitting a corner case of this syntax.



                Note, however, that without an extra empty line vcat is not called:



                julia> :([[1]
                ])
                :([[1]])


                Another use-case that is worth to know is:



                julia> [[1, 2]
                [3, 4]]
                4-element Array{Int64,1}:
                1
                2
                3
                4


                and the same with variables (can improve code readability in some cases):



                julia> a = [1,2]
                2-element Array{Int64,1}:
                1
                2

                julia> b = [3, 4]
                2-element Array{Int64,1}:
                3
                4

                julia> [a
                b]
                4-element Array{Int64,1}:
                1
                2
                3
                4






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 19 at 23:13

























                answered Nov 19 at 22:59









                Bogumił Kamiński

                11.8k11120




                11.8k11120






























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