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Array Delete Error For Numeric Arrays

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  • Array Delete Error For Numeric Arrays

    The delete function for a numeric array appends the values to the end of the file after deleting them.

    dim arr_c[5] as c
    dim arr_n[5] as n

    arr_n[1] = 10
    arr_n[2] = 20
    arr_n[3] = 30
    arr_n[4] = 40
    arr_n[5] = 50
    ui_msg_box(" Numeric : Before", str(arr_n[1]) + " " + str(arr_n[2]) + " " + str(arr_n[3]) + " " + str(arr_n[4]) + " " + str(arr_n[5]))
    arr_n.delete(2,2)
    ui_msg_box("Numeric : After", str(arr_n[1]) + " " + str(arr_n[2]) + " " + str(arr_n[3]) + " " + str(arr_n[4]) + " " + str(arr_n[5]))

    arr_c[1] = "10"
    arr_c[2] = "20"
    arr_c[3] = "30"
    arr_c[4] = "40"
    arr_c[5] = "50"
    ui_msg_box("Character : Before", arr_c[1] + " " + arr_c[2] + " " + arr_c[3] + " " + arr_c[4] + " " + arr_c[5])
    arr_c.delete(2,2)
    ui_msg_box("Character : After", arr_c[1] + " " + arr_c[2] + " " + arr_c[3] + " " + arr_c[4] + " " + arr_c[5])

  • #2
    Re: Array Delete Error For Numeric Arrays

    I've confirmed your findings and suggest you submit a formal bug report, with the sample you've just posted. Use the Help menu choice in Alpha Five to do this. Let us know what response you get back.

    By the way, I'm curious what behavior you're expecting. The method you're using does not change the size of the array, so I'd expect zeros in elements 4 and 5.

    -- tom

    Comment


    • #3
      Re: Array Delete Error For Numeric Arrays

      I'm new to A5. I'm trying to periodically reset the array and repopulate. This, I believe this will work with the character array, which is what i need. I just lucked onto the numeric error. Thanks.

      Comment


      • #4
        Re: Array Delete Error For Numeric Arrays

        Ok, if you need help submitting a formal bug report, let us know.

        Comment


        • #5
          Re: Array Delete Error For Numeric Arrays

          This is A5s response...

          yes, it is a bug, but the work around is simple:

          you should call the .set_dynamic() method before you delete items from the array


          dim aa[5] as N
          aa[1] = 1
          aa[2] = 2
          aa[3] = 3
          aa[4] = 4
          aa[5] = 5

          aa.set_dynamic(.t.)
          aa.delete(4,1)
          ?aa.dump()
          = 1
          2
          3
          5

          Comment


          • #6
            Re: Array Delete Error For Numeric Arrays

            Thanks. Not a completely satisfactory response.

            Notice that the array is re-sized automatically now. This is inconsistent with how the character array is behaving.

            If your goal is re-size the array then the work around is a great solution. If your goal is to simple replace the deleted elements with zeros it is not.

            Comment


            • #7
              Re: Array Delete Error For Numeric Arrays

              I submitted this as a bug to Selwyn couple years ago and he advised me the same thing.
              Unfortunately, .set_dynamic() method is not available in my version of alpha. The way to get around this is to resize the array.
              So, as a matter of routine, whenever I delete, I resize.

              Comment


              • #8
                Re: Array Delete Error For Numeric Arrays

                Originally posted by Tom Cone Jr View Post
                If your goal is to simple replace the deleted elements with zeros it is not.
                Tom:
                I just noticed your latest response.
                The object of array.delete is not to delete the value but to delete the element altogether, i.e. remove that element from the array.
                If, as you said, the goal is to replace the value (not the element) with zero, then you do not need array.delete in which case the proper syntax would be:
                aa[3]=0 'to replace the value of the element.
                So, I think Selwyn's response is satisfactory from my point of view and in this case you could either use this new method as a matter of routine whenever you dim an array or simply use my way if you are dealing with an older version of alpha.

                Comment


                • #9
                  Re: Array Delete Error For Numeric Arrays

                  G,

                  I agree, but I'm looking at the problem through the other end of your telescope.

                  If the elements in the array are CHARACTER data the size of the array does NOT change when the DELETE method is used.

                  Consider this:

                  Code:
                  [FONT=Courier New][SIZE=3]dim arr_c[5] as c
                  arr_c[1] = "10"
                  arr_c[2] = "20"
                  arr_c[3] = "30"
                  arr_c[4] = "40"
                  arr_c[5] = "50"
                  ui_msg_box("Character : Before", arr_c[1] + " " + arr_c[2] + " " + arr_c[3] + " " + arr_c[4] + " " + arr_c[5])
                  arr_c.delete(2,2)
                  
                  ui_msg_box("Character : After", arr_c[1] + " " + arr_c[2] + " " + arr_c[3] + " " + arr_c[4] + " " + arr_c[5])
                  
                  ?arr_c.size()
                  = 5[/SIZE][/FONT]

                  Comment


                  • #10
                    Re: Array Delete Error For Numeric Arrays

                    It does not change in any case, whether it's a charter, numeric or otherwise, UNLESS you use the new method (I have no way of testing this, but according to Selwyn it works) or you resize the array.

                    That was my contention to Selwyn, that deleting an element does not resize the array, hence the introduction by alpha in the newer versions of alpha of a method that dynamically resizes the array.
                    Last edited by G Gabriel; 04-09-2013, 09:47 AM.

                    Comment


                    • #11
                      Re: Array Delete Error For Numeric Arrays

                      One would think that a note should be added to the helps on this, no ?

                      Comment


                      • #12
                        Re: Array Delete Error For Numeric Arrays

                        Actually, I think instead of adding this new method, alpha should have retooled the array.delete() to resize at the same time. Who knows, maybe it is not that simple.

                        Comment

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