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Finding top 5 numbers

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    #1

    Finding top 5 numbers

    Is there a formula to find the top 5 numbers within a time period?
    Like if there's an (account, date, amount) database and it has records for the full year (daily)
    How can I find the top 5 (amounts) for an account during the year, I need to find the date and the amount for the top 5 for each account.

    Thanks for any help
    Tags: None
    #2
    Re: Finding top 5 numbers

    Tablemax() will tell you the top amount given a properly constructed filter. That won't help you because it only returns the one amount. You don't indicate where you want to see/use these amounts.

    Likely you'll have to use some xbasic to write the top five amount records to a temporary table and do something with that result table.

    If you need some help with the xbasic you could attach a sample table here.

    Another alternative might be to design a script which marked the top 5 amounts for each account and then just process the marked() records.
    Last edited by Stan Mathews; 04-07-2010, 04:56 PM.
    There can be only one.

    Comment

      #3
      Re: Finding top 5 numbers

      Thanks Stan, but I'm not sure how to code tablemax() to pick up like the top nth amounts.
      Doesn't tablemax look at all records ?

      If I need those in a report, can I use tablemax in the grouping region? this way will use only the accounts in group?

      But again how do you code tablemax() to pick the top 5 or 4 .... amounts ?

      Comment

        #4
        Re: Finding top 5 numbers

        Stan;

        attached is a sample file with 2 accounts.
        The better solution for me would be to pick the top 5 (Total_initial) for each account and store those records in a separate database, including all fields.

        Is that possible ?

        Comment

          #5
          Re: Finding top 5 numbers

          I think so. Just run the script (copier)and look at samp_done.

          I used total_main but you can just edit that to total_init if you you like.

          Changed attachment, got the wrong one.
          There can be only one.

          Comment

            #6
            Re: Finding top 5 numbers

            Stan;

            I don't see the script, in the zipped file was just the DBF

            Comment

              #7
              Re: Finding top 5 numbers

              Thank you very much, I see it now, I will take a look at it and will update you.

              Greatly appreciated.

              Comment

                #8
                Re: Finding top 5 numbers

                If a query sets the correct ordering expression can't you use an optional sub-select routine to select the top 5? I think this is available in the query genie. Naturally, you'd have to arrange the records in an inverted sequence. The top five in a sort from lowest to highest would be the 5 lowest amounts. You'd want to sort the records from highest to lowest (descending, or inverted) so the "top" five would be the highest, right?

                Comment

                  #9
                  Re: Finding top 5 numbers

                  I believe he wants the top 5 for each account. Using the sub-select only gets the top five overall, I believe.
                  There can be only one.

                  Comment

                    #10
                    Re: Finding top 5 numbers

                    Thank you Stan, the code works great. I understand the first part of the while statement for i = 1 TO 5, but what does the else part do
                    FOR t = 1 TO recs
                    tbl.change_begin()
                    tbl.mark()
                    tbl.change_end(.T.)
                    tbl.fetch_next()

                    Comment

                      #11
                      Re: Finding top 5 numbers

                      The script puts the records in order by account ascending and init_total descending. If there are more than five records for an account, it marks the top five. If there are less than five records it marks them all.

                      If a new account is added and the script run within five days there wouldn't be five records for that account and the 1 to 5 would mark some records from the wrong account.
                      There can be only one.

                      Comment

                        #12
                        Re: Finding top 5 numbers

                        Got it, I didn't think of that, having less than five days.
                        Thank you very much that works perfectly.

                        Comment

                          #13
                          Re: Finding top 5 numbers

                          Ok. I thought he was looking for a way to get this for a single account, and since the sub-select option had not been mentioned...

                          Comment

                            #14
                            Re: Finding top 5 numbers

                            Thank You Tom

                            Comment

                              #15
                              Re: Finding top 5 numbers

                              Stan;

                              This is part of the report created,
                              Code:
                               
[COLOR=darkred]10031F1 INCITTI RICK[/COLOR]
[COLOR=darkred]Total initial   Date               .016 of Initial Margin[/COLOR]
[COLOR=darkred]$10,692.00 12/30/2009        $171.07[/COLOR]
[COLOR=darkred]$10,692.00 12/31/2009        $171.07[/COLOR]
[COLOR=darkred]$8,708.00 12/22/2009         $139.33[/COLOR]
[COLOR=darkred]$8,708.00 12/23/2009        $139.33[/COLOR]
[COLOR=darkred]$8,708.00 12/24/2009        $139.33[/COLOR]
[COLOR=#8b0000]-----------------------------------------------------[/COLOR]
[COLOR=darkred]Average Initial Margin for 10031 : $9,501.60[/COLOR]
                              The average Initial Margin is an average of the 5 amounts, how can I find the average of the last 3 amounts in this dislay but still shows the 5 as in this report.

                              Comment

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