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Numeric Rounding

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    #1

    Numeric Rounding

    I am having difficulty in rounding our retail prices - not to the nearest dollar but to the nearest quarter. Our pricing is based off of a publishers list price, for example a new book is listed at 12.95, we price our books at .72 of that, 9.324, and rounding up to the nearest quarter, ending up with 9.50.

    Does anyone know of a way to have alpha five do this for me?

    Thank you
    Tags: None
    #2
    Re: Numeric Rounding

    nAmt = 12.95

    ?round_up(nAmt*.72*4,0)/4
    = 9.500000

    Originally posted by kraftees View Post
    ... and rounding up to the nearest quarter, ending up with 9.50.
    9.25 would be the "nearest" multiple of a quarter for 9.324. If you really want the nearest, change the round_up() function above to round(). If you want "to round up to the next multiple of a quarter", leave as is.
    Last edited by Steve Andrews; 08-11-2009, 01:21 PM.

    Comment

      #3
      Re: Numeric Rounding

      Unbelievable. Thank you so much I am in shock right now. All summer was trying to figure this out and a couple minutes after my post you saved me.

      Much appreciation!!!!

      Comment

        #4
        Re: Numeric Rounding

        Someone asked an IDENTICAL question few months back. Several UDF'd were posted.

        Comment

          #5
          Re: Numeric Rounding

          Can't seem to find that thread! but here is a different take:
          Code:
          dim x as n=9.32
?x+.25-mod(x,.25)
=9.5
          And if you want to put this in a UDF wherein the rounding could be based on the nearest .25, .50 or any other fraction you want:
          Code:
          FUNCTION round_up_fraction AS N (base AS N, rounding_fraction AS N )
	round_up_fraction=base+rounding_fraction-mod(base,rounding_fraction)
END FUNCTION
          So if you want to round up to the nearest .50:
          Code:
          ?round_up_fraction(x,.5)
= 9.5
          Or to the nearest .75
          Code:
          ?round_up_fraction(x,.75)
= 9.75
          Or to the nearest .85 (any goffy number)
          Code:
          ?round_up_fraction(x,.85)
= 9.35 
'looks odd, doesn't it? but it's the correct answer. 
'(there is a lesson here! Rounding up a higher fraction doesn't 
'necessarily mean getting a higher price. 
'Choose your fractions wisely.)
          Last edited by G Gabriel; 08-11-2009, 04:35 PM.

          Comment

            #6
            Re: Numeric Rounding

            John,

            Make sure you test the examples given to you. As you can see below the two different examples for rounding up to the next quarter to not generate the same answer in all cases.

            Code:
            dim x as n=9.25
?round_up(x*4,0)/4
= 9.25
?x+.25-mod(x,.25)
= 9.5
            Jeff Ryder

            Comment

              #7
              Re: Numeric Rounding

              I believe this is the thread G is referring to....time flies by quickly for us all it seems as it was quite a bit more than a few months ago if this is indeed the thread!

              http://msgboard.alphasoftware.com/al...ighlight=round
              Mike
              __________________________________________
              It is only when we forget all our learning that we begin to know.
              It's not what you look at that matters, it's what you see.
              Henry David Thoreau
              __________________________________________



              Comment

                #8
                Re: Numeric Rounding

                Originally posted by jaryder View Post
                John,

                Make sure you test the examples given to you. As you can see below the two different examples for rounding up to the next quarter to not generate the same answer in all cases.

                Code:
                dim x as n=9.25
?round_up(x*4,0)/4
= 9.25
?x+.25-mod(x,.25)
= 9.5
                So you don't loose sleep over this:
                Code:
                ?x+if(mod(x,.25)=0,0,.25-mod(x,.25))
= 9.25

                Comment

                  #9
                  Re: Numeric Rounding

                  Yeh.. that's the thread.

                  Comment

                    #10
                    Re: Numeric Rounding

                    The whole concept behind my expression is WRONG.
                    I was waiting for "Roger Ebert" to catch it, but I guess Ebert could only go so far, so here is a hint. The correct expression should be:
                    Code:
                    dim x as n=9.25
?int(x)+.25*round_up((x-int(x))/.25,0)
= 9.25

                    Comment

                      #11
                      Re: Numeric Rounding

                      Why not just use the function created in the linked thread as then can be used for any rounding? But also make sure to read the comments provided for possible error trap omissions in the function that have not been accounted for--think negative numbers was one...

                      Code:
                      FUNCTION Round_Cents_tox AS N (num as n,round_to_amt AS N )
   Round_Cents_tox = int(num)+(int(round((num-int(num))*100/round_to_amt,0))*round_to_amt/100)
END FUNCTION
                      Mike
                      __________________________________________
                      It is only when we forget all our learning that we begin to know.
                      It's not what you look at that matters, it's what you see.
                      Henry David Thoreau
                      __________________________________________



                      Comment

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