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Wrong result is coming while adding tow figures
Hi all,
I wrote the following function . But in some time the result is showing wrong format. When VarSum gets value 185.42 and ValueSum gets -185.42 the result should be 0. VarSum = VarSum + ValueSum 0= 185 + - 185 . But some cases Excel shows the balance as 8.5265128E-14. Please help. I given the function below. Sub CashBookMacrosnew() Dim VarSum As Double Dim ValueSum As Double Dim VarSumOld As Double Dim totalsum As Double lastrow = Range("B" & Rows.Count).End(xlUp).Row currow = ActiveCell.Row pre_row = ActiveCell.Row Col_A = "" For RowCount = 1 To lastrow If RowCount 1 Then pre_row = RowCount - 1 If Range("A" & RowCount) < "" Then VarSumOld = VarSum VarSum = Range("R" & RowCount) Range("Y" & pre_row) = VarSumOld Else ValueSum = (Range("R" & RowCount) + Range("S" & RowCount) + Range("T" & RowCount) + _ Range("U" & RowCount) + Range("V" & RowCount) + Range("W" & RowCount) + _ Range("X" & RowCount)) VarSum = VarSum + ValueSum End If End If Next RowCount End Sub |
Wrong result is coming while adding tow figures
The extremely small difference is caused by the inability of a digital system
to accurately represent all analog values. If you're only interested in 2 decimal places, replace VarSum = VarSum + ValueSum with VarSum = INT((VarSum + ValueSum) * 100)/100 "pol" wrote: Hi all, I wrote the following function . But in some time the result is showing wrong format. When VarSum gets value 185.42 and ValueSum gets -185.42 the result should be 0. VarSum = VarSum + ValueSum 0= 185 + - 185 . But some cases Excel shows the balance as 8.5265128E-14. Please help. I given the function below. Sub CashBookMacrosnew() Dim VarSum As Double Dim ValueSum As Double Dim VarSumOld As Double Dim totalsum As Double lastrow = Range("B" & Rows.Count).End(xlUp).Row currow = ActiveCell.Row pre_row = ActiveCell.Row Col_A = "" For RowCount = 1 To lastrow If RowCount 1 Then pre_row = RowCount - 1 If Range("A" & RowCount) < "" Then VarSumOld = VarSum VarSum = Range("R" & RowCount) Range("Y" & pre_row) = VarSumOld Else ValueSum = (Range("R" & RowCount) + Range("S" & RowCount) + Range("T" & RowCount) + _ Range("U" & RowCount) + Range("V" & RowCount) + Range("W" & RowCount) + _ Range("X" & RowCount)) VarSum = VarSum + ValueSum End If End If Next RowCount End Sub |
Wrong result is coming while adding tow figures
The problem has to do with computers way of converting digital numbers
(number using base 10) to binary (base 2) and is a well known problem - see sites below. I am not sure what JLatham mean by "analog". Excel (and most other apps) store number with 15 digit precision, To avoid this: suppose your formula is =A1+A2, replace this by =ROUND(A1+A2,10) The 10 could be another value such as 6 or 12, depending on the precision of you work best wishes -- Bernard Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme Chip's clear explanation http://www.cpearson.com/excel/rounding.htm Floating-point arithmetic may give inaccurate results in Excel http://support.microsoft.com/kb/78113/en-us (Complete) Tutorial to Understand IEEE Floating-Point Errors http://support.microsoft.com/kb/42980 What Every Computer Scientist Should Know About Floating Point http://docs.sun.com/source/806-3568/ncg_goldberg.html http://www.cpearson.com/excel/rounding.htm Visual Basic and Arithmetic Precision http://support.microsoft.com/default...NoWebContent=1 Others: http://support.microsoft.com/kb/214118 http://docs.sun.com/source/806-3568/ncg_goldberg.html Go to source web page "pol" wrote in message ... Hi all, I wrote the following function . But in some time the result is showing wrong format. When VarSum gets value 185.42 and ValueSum gets -185.42 the result should be 0. VarSum = VarSum + ValueSum 0= 185 + - 185 . But some cases Excel shows the balance as 8.5265128E-14. Please help. I given the function below. Sub CashBookMacrosnew() Dim VarSum As Double Dim ValueSum As Double Dim VarSumOld As Double Dim totalsum As Double lastrow = Range("B" & Rows.Count).End(xlUp).Row currow = ActiveCell.Row pre_row = ActiveCell.Row Col_A = "" For RowCount = 1 To lastrow If RowCount 1 Then pre_row = RowCount - 1 If Range("A" & RowCount) < "" Then VarSumOld = VarSum VarSum = Range("R" & RowCount) Range("Y" & pre_row) = VarSumOld Else ValueSum = (Range("R" & RowCount) + Range("S" & RowCount) + Range("T" & RowCount) + _ Range("U" & RowCount) + Range("V" & RowCount) + Range("W" & RowCount) + _ Range("X" & RowCount)) VarSum = VarSum + ValueSum End If End If Next RowCount End Sub |
Wrong result is coming while adding tow figures
Many Thanks for the reply. Your formula is working but still have some prolem
with some figures. For example When do the calculation for 12165.68 -1118.08 -660.55 -10.51 -59.80 -8.62 -10308.12 ---------------- After applying that formula , the result is getting as 0.03 insetad of 0. Other values are correct. "JLatham" wrote: The extremely small difference is caused by the inability of a digital system to accurately represent all analog values. If you're only interested in 2 decimal places, replace VarSum = VarSum + ValueSum with VarSum = INT((VarSum + ValueSum) * 100)/100 "pol" wrote: Hi all, I wrote the following function . But in some time the result is showing wrong format. When VarSum gets value 185.42 and ValueSum gets -185.42 the result should be 0. VarSum = VarSum + ValueSum 0= 185 + - 185 . But some cases Excel shows the balance as 8.5265128E-14. Please help. I given the function below. Sub CashBookMacrosnew() Dim VarSum As Double Dim ValueSum As Double Dim VarSumOld As Double Dim totalsum As Double lastrow = Range("B" & Rows.Count).End(xlUp).Row currow = ActiveCell.Row pre_row = ActiveCell.Row Col_A = "" For RowCount = 1 To lastrow If RowCount 1 Then pre_row = RowCount - 1 If Range("A" & RowCount) < "" Then VarSumOld = VarSum VarSum = Range("R" & RowCount) Range("Y" & pre_row) = VarSumOld Else ValueSum = (Range("R" & RowCount) + Range("S" & RowCount) + Range("T" & RowCount) + _ Range("U" & RowCount) + Range("V" & RowCount) + Range("W" & RowCount) + _ Range("X" & RowCount)) VarSum = VarSum + ValueSum End If End If Next RowCount End Sub |
Wrong result is coming while adding tow figures
Now it is working fine
"Bernard Liengme" wrote: The problem has to do with computers way of converting digital numbers (number using base 10) to binary (base 2) and is a well known problem - see sites below. I am not sure what JLatham mean by "analog". Excel (and most other apps) store number with 15 digit precision, To avoid this: suppose your formula is =A1+A2, replace this by =ROUND(A1+A2,10) The 10 could be another value such as 6 or 12, depending on the precision of you work best wishes -- Bernard Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme Chip's clear explanation http://www.cpearson.com/excel/rounding.htm Floating-point arithmetic may give inaccurate results in Excel http://support.microsoft.com/kb/78113/en-us (Complete) Tutorial to Understand IEEE Floating-Point Errors http://support.microsoft.com/kb/42980 What Every Computer Scientist Should Know About Floating Point http://docs.sun.com/source/806-3568/ncg_goldberg.html http://www.cpearson.com/excel/rounding.htm Visual Basic and Arithmetic Precision http://support.microsoft.com/default...NoWebContent=1 Others: http://support.microsoft.com/kb/214118 http://docs.sun.com/source/806-3568/ncg_goldberg.html Go to source web page "pol" wrote in message ... Hi all, I wrote the following function . But in some time the result is showing wrong format. When VarSum gets value 185.42 and ValueSum gets -185.42 the result should be 0. VarSum = VarSum + ValueSum 0= 185 + - 185 . But some cases Excel shows the balance as 8.5265128E-14. Please help. I given the function below. Sub CashBookMacrosnew() Dim VarSum As Double Dim ValueSum As Double Dim VarSumOld As Double Dim totalsum As Double lastrow = Range("B" & Rows.Count).End(xlUp).Row currow = ActiveCell.Row pre_row = ActiveCell.Row Col_A = "" For RowCount = 1 To lastrow If RowCount 1 Then pre_row = RowCount - 1 If Range("A" & RowCount) < "" Then VarSumOld = VarSum VarSum = Range("R" & RowCount) Range("Y" & pre_row) = VarSumOld Else ValueSum = (Range("R" & RowCount) + Range("S" & RowCount) + Range("T" & RowCount) + _ Range("U" & RowCount) + Range("V" & RowCount) + Range("W" & RowCount) + _ Range("X" & RowCount)) VarSum = VarSum + ValueSum End If End If Next RowCount End Sub . |
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