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is this a numeric bug?

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    is this a numeric bug?

    in interactive, dim 2 variables

    dim n1 as n
    dim n2 as n
    n1=12345678911
    n2=12345678912

    then

    ?n1==n2

    notice that it returns true, which is an error - it worked in 4.5, but not in 11 (converting an app)
    Cole Custom Programming - Terrell, Texas
    972 524 8714
    [email protected]

    ____________________
    "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

    #2
    Re: is this a numeric bug?

    Martin,

    I know computers are meant to be dumb but this is ridiculous.
    Code:
    dim n1 as n
    dim n2 as n
    n1=12345678911
    n2=12345678912
    
    if n1<>n2 then
    x=.t.
    else
    x=.f.
    end if
    
    ?x
    = .F.
    Regards
    Keith Hubert
    Alpha Guild Member
    London.
    KHDB Management Systems
    Skype = keith.hubert


    For your day-to-day Needs, you Need an Alpha Database!

    Comment


      #3
      Re: is this a numeric bug?

      Martin, that looks like a bug. Suggest you submit a formal bug report.

      I see the same behavior using

      Code:
      ? n1 = n2
      or
      ?n1 <> n2
      
      Check this from the interactive window:
      n1 = 12345678911
      n2 = 12345678912
      ?n1=n2
      = .T.
      
      ?n1<> n2
      = .F.
      
      ?n2<n1
      = .F.
      
      ?n1<n2
      = .T.
      And I see the same behavior in vers 9 of Alpha Five.

      Comment


        #4
        Re: is this a numeric bug?

        Apparently, after a certain number of digits you cannot compare 2 numbers
        you can do this, though

        in interactive
        n1=12345678911
        n2=12345678912
        ?alltrim(str(n1,12,0))=alltrim(str(n2,12,0))
        .f.

        this will return correctly - but yikes, I will have to find all the places in the app where I may be doing a comparison!!!!!!
        Cole Custom Programming - Terrell, Texas
        972 524 8714
        [email protected]

        ____________________
        "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

        Comment


          #5
          Re: is this a numeric bug?

          [ deleted ]

          Comment


            #6
            Re: is this a numeric bug?

            thanks Tom - will do and report back

            not sure, but I think this has something to do with a "long" and "short" whatchamacallit
            Cole Custom Programming - Terrell, Texas
            972 524 8714
            [email protected]

            ____________________
            "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

            Comment


              #7
              Re: is this a numeric bug?

              Selwyn said it is a floating point error - not Alpha

              like
              12345678911
              12345678912
              fails
              but
              12345678913
              does not
              Cole Custom Programming - Terrell, Texas
              972 524 8714
              [email protected]

              ____________________
              "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

              Comment


                #8
                Re: is this a numeric bug?

                Would be nice to know the specific circumstances when this might be an issue?

                Comment


                  #9
                  Re: is this a numeric bug?

                  Well .... as far as I can determine it will only occur on lengths greater than nine, and only if there is only a difference of 1 in the last digit
                  Cole Custom Programming - Terrell, Texas
                  972 524 8714
                  [email protected]

                  ____________________
                  "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

                  Comment


                    #10
                    Re: is this a numeric bug?

                    And, it seems to be integer width that's key.

                    Code:
                    [FONT=Courier New]n1 = 123456789.1
                    
                    n2 = 123456789.2
                    
                    ?n1 = n2
                    = .F.[/FONT]

                    Comment


                      #11
                      Re: is this a numeric bug?

                      Would it be correct to avoid direct comparisons for these large numbers in favor of subtracting one from the other? If the result of the subtraction is not zero then the numbers are not equal, right? Here's an example:
                      n1 = 123456789111

                      n2 = 123456789112

                      ?n1 = n2
                      = .T. <=== wrong result

                      ?n2-n1
                      = 1 <=== not zero, so n1 <> n2

                      Comment


                        #12
                        Re: is this a numeric bug?

                        Brief research online indicates that we should avoid both direct comparisons and comparisons to zero when dealing with floating point numbers.

                        The recommended technique is to subtract one from the other and determine if the difference is greater than some arbitrarily small number.

                        Here's an example:

                        n1 = 12345678911
                        n2 = 12345678912

                        ?n1=n2
                        = .T. <----- wrong

                        ?n2 - n1 > 0.0000001
                        = .T. <----- so n1 <> n2

                        Comment


                          #13
                          Re: is this a numeric bug?

                          not that its worth much, but it worked in 4.5 - ran into it while converting my last 4.5 app to 11
                          Cole Custom Programming - Terrell, Texas
                          972 524 8714
                          [email protected]

                          ____________________
                          "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

                          Comment


                            #14
                            Re: is this a numeric bug?

                            Tom,
                            Very good work? Very helpful. Thank you!
                            Mike W
                            __________________________
                            "I rebel in at least small things to express to the world that I have not completely surrendered"

                            Comment

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