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How do I determine which data in a range add up to a fixed number?
How do i take a range of numbers and determine which numbers in the range add
up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers |
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How do I determine which data in a range add up to a fixed number?
You can do this using Solver". Suppose the set of numbers is in A2:A68.
Enter 1 in each cell in B2 to B68. Place the single number (120) in C2. Enter the following formula in some other cell (say C3) =SUMPRODUCT(A2:A68,B2:B68)-C2 and click ENTER. Now you are going to use Solver (the Solver add-in should be installed for this) to find the combination of numbers in Column A whose total would be equal to the single number you have entered in C2. To launch Solver, select Tools Solver (Excel 2003) or Data ribbon Analysis section Solver (Excel 2007). In the Solver Parameters window, "Set Target Cell" $C$3 "Equal To" "Value of" 0 "By Changing Cells" $B$2:$B$68 "Subject to the Constraints"-- click "Add" -- enter $B$2:$B$68, select "bin" from the popdown list (this adds a constraint which reads as "$B$2:$B$68=binary") Click "Solve" The solver will find the solution by changing some of the 1's in Column B to 0's. The set of Column A numbers for which Column B is 1 (and not 0) is the solution for your problem. If the solution is satisfactory, click "Keep Solver Solution". Note that if more than one solution is possible, Solver will only find the first solution. If the Solver button does not appear on the Data tab on the Ribbon (Excel 2007), click the Microsoft Office Button, Excel Options, Add-Ins category, and then click the Go button. Then select the Solver Add-In check box, and click OK to install it. Click Yes to confirm that you want to install the Solver add-in. Hope this helps, Hutch "Mray" wrote: How do i take a range of numbers and determine which numbers in the range add up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers |
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How do I determine which data in a range add up to a fixed number?
=?Utf-8?B?VG9tIEh1dGNoaW5z?=
wrote in : You can do this using Solver". Suppose the set of numbers is in A2:A68. Enter 1 in each cell in B2 to B68. Place the single number (120) in C2. Enter the following formula in some other cell (say C3) =SUMPRODUCT(A2:A68,B2:B68)-C2 and click ENTER. Now you are going to use Solver (the Solver add-in should be installed for this) to find the combination of numbers in Column A whose total would be equal to the single number you have entered in C2. To launch Solver, select Tools Solver (Excel 2003) or Data ribbon Analysis section Solver (Excel 2007). In the Solver Parameters window, "Set Target Cell" $C$3 "Equal To" "Value of" 0 "By Changing Cells" $B$2:$B$68 "Subject to the Constraints"-- click "Add" -- enter $B$2:$B$68, select "bin" from the popdown list (this adds a constraint which reads as "$B$2:$B$68=binary") Click "Solve" The solver will find the solution by changing some of the 1's in Column B to 0's. The set of Column A numbers for which Column B is 1 (and not 0) is the solution for your problem. If the solution is satisfactory, click "Keep Solver Solution". Note that if more than one solution is possible, Solver will only find the first solution. If the Solver button does not appear on the Data tab on the Ribbon (Excel 2007), click the Microsoft Office Button, Excel Options, Add-Ins category, and then click the Go button. Then select the Solver Add-In check box, and click OK to install it. Click Yes to confirm that you want to install the Solver add-in. Hope this helps, Hutch "Mray" wrote: How do i take a range of numbers and determine which numbers in the range add up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers thats a great solution |
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How do I determine which data in a range add up to a fixed number?
Here is another solution. I adapted this code from a C-language program I
wrote forever ago. It won't necessarily find every possible solution, but it can find multiple solutions (if they exist). The output is written to a new sheet the macro adds at the end of the workbook. To run the macro, select the range of 67 numbers. Then press Alt-F8 to bring up a list of available macros. Select Knapsack OK. The macro will prompt you for a target number. Enter 120 and click OK. 'Global variables for Knapsack Public Type RngType Nbr As Double 'Number in cell Addr As String 'Address of cell End Type Public Cellz() As RngType, Targett As Double Public Kount As Currency, RngCnt As Long, strTarget As String Public Soln() As RngType, SolnCnt As Long Public SolnNbr As Long, SolnRow As Long Sub Knapsack() 'Calls function KS to find combinations of values 'within the selection that total the target number. 'Current LIMITS: only finds target numbers which 'are positive numbers; can find multiple solutions, 'but not necessarily every possible solution. Also, 'if the target is the sum of the only two numbers in the 'selection which are smaller than the target, it may not 'find the solution. Dim c As Range, aa As Long, bb As Long, msg101 As String Dim Temp() As RngType, NegFlag As Boolean, BigFlag As Boolean On Error GoTo KSerr1 'Check if the selected range has 2 cells. If Selection.Count 3 Then MsgBox "You must select more than 2 cells", , "Are you kidding?" Exit Sub End If 'Get the target number from the user. strTarget$ = InputBox("Enter the target amount") If Len(strTarget$) = 0 Then Exit Sub Targett# = CDbl(strTarget$) 'Load range to be checked into Cellz array. 'Store the address & value from each cell in the selected range. RngCnt& = -1 For Each c In Selection RngCnt& = RngCnt& + 1 ReDim Preserve Temp(RngCnt&) Temp(RngCnt&).Addr = c.Address Temp(RngCnt&).Nbr = c.Value Next c 'Add one more dummy element to Cellz() to make sure last cell gets tested. RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Cellz(RngCnt& - 1).Addr Cellz(RngCnt&).Nbr = 0 'See if there are any negative numbers or numbers larger than Targett# in Temp(). BigFlag = False NegFlag = False For aa& = 0 To (RngCnt& - 1) If Temp(aa&).Nbr 0 Then NegFlag = True ElseIf Temp(aa&).Nbr Targett# Then BigFlag = True End If Next aa& 'If both NegFlag and BigFlag are True (or False), 'copy all elements of Temp() to Cellz(). If Negflag is False but 'BigFlag is True, copy only elements that are smaller than Targett#. bb& = RngCnt& - 1 RngCnt& = -1 For aa& = 0 To bb& If (BigFlag = True) And (NegFlag = False) Then If (Temp(aa&).Nbr = Targett#) And (Temp(aa&).Nbr 0) Then RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(aa&).Addr Cellz(RngCnt&).Nbr = Temp(aa&).Nbr End If Else If Temp(aa&).Nbr 0 Then RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(aa&).Addr Cellz(RngCnt&).Nbr = Temp(aa&).Nbr End If End If Next aa& 'Add one more dummy element to Cellz() to make sure last cell gets tested. RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(RngCnt& - 1).Addr Cellz(RngCnt&).Nbr = 0 'Set Kount@ and SolnNbr& to zero. Kount@ = 0 SolnNbr& = 0 'First call to KS() starts the chain of recursive calls. The For..Next 'loop starts a new chain every time the previous chain returns a solution 'or False (no solution). Each new chain starts one element farther in 'Cellz(), to ensure that a different solution, if any, will be found. 'However, this means that the first element in Cellz() can only be in 1 'solution, the 2nd element can only be in 2 solutions, etc. So, we are 'still not finding every possible solution. For bb& = 0 To (RngCnt& - 1) SolnCnt& = -1 If KS(Cellz(bb&).Nbr, bb& + 1) Then SolnNbr& = SolnNbr& + 1 SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(bb&).Addr Soln(SolnCnt&).Nbr = Cellz(bb&).Nbr 'Add a new worksheet to the current workbook at the end. If SolnNbr& = 1 Then Worksheets.Add.Move After:=Worksheets(Worksheets.Count) SolnRow& = 1 Else 'Find the last row with data in column A. Cells(65535, 1).Select Selection.End(xlUp).Select Selection.Offset(4, 0).Select SolnRow& = Selection.Row End If 'Stop before hitting the last row of the worksheet & abending. If (SolnCnt& + SolnRow&) Rows.Count Then MsgBox "Can't fit all the solutions on the sheet", , "Error" Exit Sub End If 'List the elements in Soln(), which make up the solution. For aa& = 1 To SolnCnt& ActiveSheet.Cells(aa& + SolnRow& + 2, 1).Value = Soln(aa&).Addr ActiveSheet.Cells(aa& + SolnRow& + 2, 2).Value = Soln(aa&).Nbr 'Add some headings also. Cells(SolnRow&, 1).Value = Targett# Cells(SolnRow&, 2).Value = " = Target" Cells(SolnRow& + 2, 1).Value = "Cell" Cells(SolnRow& + 2, 2).Value = "Value" Next aa& End If 'Clear the array before the next iteration. ReDim Soln(0) Next bb& 'Find the last row with data in column A. 4 rows down, summarize the results. If SolnNbr& 0 Then Cells(65535, 1).Select Selection.End(xlUp).Select Selection.Offset(4, 0).Select Selection.Value = SolnNbr& & _ " solutions were found. KS function was called " & Kount@ & " times." End If 'Tell user we are done. Summarize results. MsgBox SolnNbr& & _ " solutions were found. KS function was called " & Kount@ & " times.", , "Done!" Exit Sub KSerr1: If Err.Number 0 Then msg101$ = "Error # " & Str(Err.Number) & " was generated by " _ & Err.Source & Chr(13) & Err.Description MsgBox msg101$, , "Knapsack error", Err.HelpFile, Err.HelpContext End If End Sub Public Function KS(yy As Double, xx As Long) As Boolean 'My own recursive AND iterative algorithm for the classic 'knapsack programming problem. yy& is the cumulative total 'tested against the target number in this call, and passed 'to the next call increased by the next element of Cellz(). Dim nn As Long 'Call DoEvents so the screen can refresh, etc. DoEvents 'Add 1 to Kount every time function is called. Kount@ = Kount@ + 1 'Start a loop to test all remaining values of Cellz[xx] 'from this point in the solution chain. nn& = xx& Do While nn& = RngCnt& If (yy# = Targett#) Then 'Found a solution in this call! Increase Soln() and save info 'about the last element of Cellz() that was tried (nn&, which 'should always be the same as xx& at this point in the function). SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(nn&).Addr Soln(SolnCnt&).Nbr = Cellz(nn&).Nbr 'Return True to the calling function. KS = True Exit Function ElseIf (yy# Targett#) Then 'yy& in this call exceeds the target number. Return False to the 'calling function. KS = False Exit Function 'yy& is still less than the target number. Call KS() again, adding 'the next element in Cellz() to yy& ElseIf (KS(yy# + Cellz(nn&).Nbr, nn& + 1)) Then 'The call to another element of Cellz() found a successful chain. 'Info about that element of Cellz() has already been saved in Soln(). 'Now increase Soln() and store information about the Cellz() element 'in this call that is one link earlier in the solution chain. SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(nn&).Addr Soln(SolnCnt&).Nbr = Cellz(nn&).Nbr 'Return True to the calling function. KS = True Exit Function End If nn& = nn& + 1 Loop KS = False End Function Put the code in a general VBA module in your workbook. If you are new to macros, this link to Jon Peltier's site may be helpful: http://peltiertech.com/WordPress/200...e-elses-macro/ Some of the lines may wrap from being posted in the forum. The visiual basic editor will color these red until you fix (unwrap) them. Hope this helps, Hutch "Mray" wrote: How do i take a range of numbers and determine which numbers in the range add up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers |
#5
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How do I determine which data in a range add up to a fixed num
Tom...
wow...its really great... more fast and more choice... thank you so much.... "Tom Hutchins" wrote: Here is another solution. I adapted this code from a C-language program I wrote forever ago. It won't necessarily find every possible solution, but it can find multiple solutions (if they exist). The output is written to a new sheet the macro adds at the end of the workbook. To run the macro, select the range of 67 numbers. Then press Alt-F8 to bring up a list of available macros. Select Knapsack OK. The macro will prompt you for a target number. Enter 120 and click OK. 'Global variables for Knapsack Public Type RngType Nbr As Double 'Number in cell Addr As String 'Address of cell End Type Public Cellz() As RngType, Targett As Double Public Kount As Currency, RngCnt As Long, strTarget As String Public Soln() As RngType, SolnCnt As Long Public SolnNbr As Long, SolnRow As Long Sub Knapsack() 'Calls function KS to find combinations of values 'within the selection that total the target number. 'Current LIMITS: only finds target numbers which 'are positive numbers; can find multiple solutions, 'but not necessarily every possible solution. Also, 'if the target is the sum of the only two numbers in the 'selection which are smaller than the target, it may not 'find the solution. Dim c As Range, aa As Long, bb As Long, msg101 As String Dim Temp() As RngType, NegFlag As Boolean, BigFlag As Boolean On Error GoTo KSerr1 'Check if the selected range has 2 cells. If Selection.Count 3 Then MsgBox "You must select more than 2 cells", , "Are you kidding?" Exit Sub End If 'Get the target number from the user. strTarget$ = InputBox("Enter the target amount") If Len(strTarget$) = 0 Then Exit Sub Targett# = CDbl(strTarget$) 'Load range to be checked into Cellz array. 'Store the address & value from each cell in the selected range. RngCnt& = -1 For Each c In Selection RngCnt& = RngCnt& + 1 ReDim Preserve Temp(RngCnt&) Temp(RngCnt&).Addr = c.Address Temp(RngCnt&).Nbr = c.Value Next c 'Add one more dummy element to Cellz() to make sure last cell gets tested. RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Cellz(RngCnt& - 1).Addr Cellz(RngCnt&).Nbr = 0 'See if there are any negative numbers or numbers larger than Targett# in Temp(). BigFlag = False NegFlag = False For aa& = 0 To (RngCnt& - 1) If Temp(aa&).Nbr 0 Then NegFlag = True ElseIf Temp(aa&).Nbr Targett# Then BigFlag = True End If Next aa& 'If both NegFlag and BigFlag are True (or False), 'copy all elements of Temp() to Cellz(). If Negflag is False but 'BigFlag is True, copy only elements that are smaller than Targett#. bb& = RngCnt& - 1 RngCnt& = -1 For aa& = 0 To bb& If (BigFlag = True) And (NegFlag = False) Then If (Temp(aa&).Nbr = Targett#) And (Temp(aa&).Nbr 0) Then RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(aa&).Addr Cellz(RngCnt&).Nbr = Temp(aa&).Nbr End If Else If Temp(aa&).Nbr 0 Then RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(aa&).Addr Cellz(RngCnt&).Nbr = Temp(aa&).Nbr End If End If Next aa& 'Add one more dummy element to Cellz() to make sure last cell gets tested. RngCnt& = RngCnt& + 1 ReDim Preserve Cellz(RngCnt&) Cellz(RngCnt&).Addr = Temp(RngCnt& - 1).Addr Cellz(RngCnt&).Nbr = 0 'Set Kount@ and SolnNbr& to zero. Kount@ = 0 SolnNbr& = 0 'First call to KS() starts the chain of recursive calls. The For..Next 'loop starts a new chain every time the previous chain returns a solution 'or False (no solution). Each new chain starts one element farther in 'Cellz(), to ensure that a different solution, if any, will be found. 'However, this means that the first element in Cellz() can only be in 1 'solution, the 2nd element can only be in 2 solutions, etc. So, we are 'still not finding every possible solution. For bb& = 0 To (RngCnt& - 1) SolnCnt& = -1 If KS(Cellz(bb&).Nbr, bb& + 1) Then SolnNbr& = SolnNbr& + 1 SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(bb&).Addr Soln(SolnCnt&).Nbr = Cellz(bb&).Nbr 'Add a new worksheet to the current workbook at the end. If SolnNbr& = 1 Then Worksheets.Add.Move After:=Worksheets(Worksheets.Count) SolnRow& = 1 Else 'Find the last row with data in column A. Cells(65535, 1).Select Selection.End(xlUp).Select Selection.Offset(4, 0).Select SolnRow& = Selection.Row End If 'Stop before hitting the last row of the worksheet & abending. If (SolnCnt& + SolnRow&) Rows.Count Then MsgBox "Can't fit all the solutions on the sheet", , "Error" Exit Sub End If 'List the elements in Soln(), which make up the solution. For aa& = 1 To SolnCnt& ActiveSheet.Cells(aa& + SolnRow& + 2, 1).Value = Soln(aa&).Addr ActiveSheet.Cells(aa& + SolnRow& + 2, 2).Value = Soln(aa&).Nbr 'Add some headings also. Cells(SolnRow&, 1).Value = Targett# Cells(SolnRow&, 2).Value = " = Target" Cells(SolnRow& + 2, 1).Value = "Cell" Cells(SolnRow& + 2, 2).Value = "Value" Next aa& End If 'Clear the array before the next iteration. ReDim Soln(0) Next bb& 'Find the last row with data in column A. 4 rows down, summarize the results. If SolnNbr& 0 Then Cells(65535, 1).Select Selection.End(xlUp).Select Selection.Offset(4, 0).Select Selection.Value = SolnNbr& & _ " solutions were found. KS function was called " & Kount@ & " times." End If 'Tell user we are done. Summarize results. MsgBox SolnNbr& & _ " solutions were found. KS function was called " & Kount@ & " times.", , "Done!" Exit Sub KSerr1: If Err.Number 0 Then msg101$ = "Error # " & Str(Err.Number) & " was generated by " _ & Err.Source & Chr(13) & Err.Description MsgBox msg101$, , "Knapsack error", Err.HelpFile, Err.HelpContext End If End Sub Public Function KS(yy As Double, xx As Long) As Boolean 'My own recursive AND iterative algorithm for the classic 'knapsack programming problem. yy& is the cumulative total 'tested against the target number in this call, and passed 'to the next call increased by the next element of Cellz(). Dim nn As Long 'Call DoEvents so the screen can refresh, etc. DoEvents 'Add 1 to Kount every time function is called. Kount@ = Kount@ + 1 'Start a loop to test all remaining values of Cellz[xx] 'from this point in the solution chain. nn& = xx& Do While nn& = RngCnt& If (yy# = Targett#) Then 'Found a solution in this call! Increase Soln() and save info 'about the last element of Cellz() that was tried (nn&, which 'should always be the same as xx& at this point in the function). SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(nn&).Addr Soln(SolnCnt&).Nbr = Cellz(nn&).Nbr 'Return True to the calling function. KS = True Exit Function ElseIf (yy# Targett#) Then 'yy& in this call exceeds the target number. Return False to the 'calling function. KS = False Exit Function 'yy& is still less than the target number. Call KS() again, adding 'the next element in Cellz() to yy& ElseIf (KS(yy# + Cellz(nn&).Nbr, nn& + 1)) Then 'The call to another element of Cellz() found a successful chain. 'Info about that element of Cellz() has already been saved in Soln(). 'Now increase Soln() and store information about the Cellz() element 'in this call that is one link earlier in the solution chain. SolnCnt& = SolnCnt& + 1 ReDim Preserve Soln(SolnCnt&) Soln(SolnCnt&).Addr = Cellz(nn&).Addr Soln(SolnCnt&).Nbr = Cellz(nn&).Nbr 'Return True to the calling function. KS = True Exit Function End If nn& = nn& + 1 Loop KS = False End Function Put the code in a general VBA module in your workbook. If you are new to macros, this link to Jon Peltier's site may be helpful: http://peltiertech.com/WordPress/200...e-elses-macro/ Some of the lines may wrap from being posted in the forum. The visiual basic editor will color these red until you fix (unwrap) them. Hope this helps, Hutch "Mray" wrote: How do i take a range of numbers and determine which numbers in the range add up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers |
#6
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How do I determine which data in a range add up to a fixed num
I'm using Excel 2003 and when I tried this the 1's were changed to decimals
not zeros - presumably because Solver was finding an exact solution rather than, as the orginal post here requested, a 'nearest to zero' solution. Any ideas on how to get this 'nearest to zero' solution? Regards, Tom-S "Tom Hutchins" wrote: You can do this using Solver". Suppose the set of numbers is in A2:A68. Enter 1 in each cell in B2 to B68. Place the single number (120) in C2. Enter the following formula in some other cell (say C3) =SUMPRODUCT(A2:A68,B2:B68)-C2 and click ENTER. Now you are going to use Solver (the Solver add-in should be installed for this) to find the combination of numbers in Column A whose total would be equal to the single number you have entered in C2. To launch Solver, select Tools Solver (Excel 2003) or Data ribbon Analysis section Solver (Excel 2007). In the Solver Parameters window, "Set Target Cell" $C$3 "Equal To" "Value of" 0 "By Changing Cells" $B$2:$B$68 "Subject to the Constraints"-- click "Add" -- enter $B$2:$B$68, select "bin" from the popdown list (this adds a constraint which reads as "$B$2:$B$68=binary") Click "Solve" The solver will find the solution by changing some of the 1's in Column B to 0's. The set of Column A numbers for which Column B is 1 (and not 0) is the solution for your problem. If the solution is satisfactory, click "Keep Solver Solution". Note that if more than one solution is possible, Solver will only find the first solution. If the Solver button does not appear on the Data tab on the Ribbon (Excel 2007), click the Microsoft Office Button, Excel Options, Add-Ins category, and then click the Go button. Then select the Solver Add-In check box, and click OK to install it. Click Yes to confirm that you want to install the Solver add-in. Hope this helps, Hutch "Mray" wrote: How do i take a range of numbers and determine which numbers in the range add up to 120? or as close to it as possible? I have list of 67 numbers totaling 710. I need to know which combination will add to 120 or as close to it as possible, remove the first result, and repeat it until I have used all the numbers |
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