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Slight rounding error

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    Slight rounding error

    I have a penny error sometimes depending if one calculated field rounds up. For example I have a sub total of $299.00. I have a calculated field for sales tax which is that sub total times the tax rate of .095 percent which equals $28.405. I have the format properties for these fields set to two decimal places and $123,456.78(blank if zero}. Alpha rounds it up to $28.41. So far so good. Then I have a calculated total field which adds the two previous fields together. Really simple. However when Alpha adds the two fields, 299.00 + 28.41 it gives 327.40 instead of 327.41. I had the same thing happen in V4.5. I know there has got to be something really simple I can do to correct this. However, I haven't figured it out. I tried setting the sales tax field to 3 decimal places thinking the dollar format would take care of the third decimal place and let it add correctly, but it showed the 28.405 which I didn't want. Someone tell me how dumb I am and tell me how to fix this. It's not that big of a deal, just annoying.

    Re: Slight rounding error

    Maybe you just need to round the sum.

    Here's a different approach that computes the total without doing addition.

    ?299 * 0.095
    = 28.405
    ?299 * 1.095
    = 327.405
    ?round(299 * 1.095,2)
    = 327.41


      Re: Slight rounding error

      Thanks Tom for the reply. Sounds so simple but it didn't work. Alpha is really a strange beast, because in its world 299*.095= 28.41 to 2 decimal places but 299*1.095=327.40 to 2 decimal places.
      So to solve my dilema, I made 2 calculated fields to get the correct result.

      One, the field containing the 299 times 1.095 to 3 decimal places, as you suggested. This gives 327.405

      Two, to get the right result, round(the calculated field above,2)which gives 327.41. Ureka. I am coming around , I belive I used a function, round()

      But this still doesn't explain Alpha's weird math, I'll leave that to the alphaolics.


        Re: Slight rounding error

        Sorry about that Tom, I was in such a hurry I didn't notice the last line of your post which is exactly what I did and worked just like you said. I am kinda glad I didn't notice it because it made me fiqure something out for myself. And it appears there will be a lot of that going on as I use Alpha. Even though I did it in around about way. No pun intended


          Re: Slight rounding error

          But this still doesn't explain Alpha's weird math
          The difficulty you see is present in all computer languages. Alpha, and other languages, must use binary math internally, while we use decimal math in the real world. In the same way we struggle to represent one divided by three using decimal math, binary math cannot represent, exactly, certain decimal values. It's a fact of life with computers.... not a glitch in Alpha.


            Re: Slight rounding error

            This a bug.. and a weird one.


              Re: Slight rounding error

              I am humbled to have two certified Alphaholics respond to this situation. I see, like politics and religion, there is a difference of thought on the subject

              One, this is just the way it is and two its a bug

              Anyway, I guess that's the reason Alpha has the round()function!
              I surely appreciate your input and I know I will be calling on the Alphaholic community again. Bear with me and my dumb question as I try to conquer V9.
              Thanks and have a good labor day weekend.