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Limit the Value of a Cell to only Negative

Hello,

I would like to limit the value of a cell to only be negative.  
I have a formula in this cell
=IFERROR(VLOOKUP("*Interest exp*",IncomeStmnt!$A$3:$L$56,2,0),0)

Therefore it is not a manuel entry.  
I know I can limit to only negative if I actually typed a number into the cell but this is not the case.

How can I limit the value of the cell to only negative if there is a formula in the cell?
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pdvsa
Asked:
pdvsa
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2 Solutions
 
Saqib Husain, SyedEngineerCommented:
What should happen if the value is negative?
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Rory ArchibaldCommented:
Perhaps simply:

=MIN(IFERROR(VLOOKUP("*Interest exp*",IncomeStmnt!$A$3:$L$56,2,0),0),0)
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Leo TorresSQL DeveloperCommented:
The question is so what do you want to happen if the value is not negative.. Error message to user..

this would have to be done in VBA code..

Private Sub Worksheet_Change(ByVal Target As Range)
If Target = Range("A1") Then
    If Range("A1").Value < 0 Then
        
   MsgBox ("Value must be positive")
    End If
End If
End Sub

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Rory ArchibaldCommented:
Worksheet_Change will not be triggered by a formula calculation though - you would need the Calculate event.
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Leo TorresSQL DeveloperCommented:
Good point rorya:

I im out of shape on VBA its been a while..

Thanks.. but the logic remains the same it should still work

:)
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pdvsaProject financeAuthor Commented:
Sorry for my late reply.  I have been very busy with my "real" job.  I hope to test in a few hours when i am at a computer.   Thank you
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pdvsaProject financeAuthor Commented:
Hi, I would rather not have a VBA enabled excel file (if possible).  A warning message is not absolutely necessary but it nice to have but I think the only way to have that is by VBA but what do I know (not much).  If the file is distributed, otheres will not know what to do when they get the enable macros security message.  

I am not sure if the formula by rorya changes the value to negative in cell:  (VLOOKUP("*Interest exp*",IncomeStmnt!$A$3:$L$56,2   if it was positive?

thank you.
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Saqib Husain, SyedEngineerCommented:
If you simply want the positive value of that number then you can use

=abs(IFERROR(VLOOKUP("*Interest exp*",IncomeStmnt!$A$3:$L$56,2,0),0))
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Rory ArchibaldCommented:
No, mine returns 0 if the value is positive. If you simply want to convert it to negative, then:

=-ABS(IFERROR(VLOOKUP("*Interest exp*",IncomeStmnt!$A$3:$L$56,2,0),0))
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pdvsaProject financeAuthor Commented:
I decided to award points to two experts.  I hope that is fair.   I did not say in my initial question I was not interested in VBA.   I thought of this afterwards.  Thank you.

Rorya:  that worked perfectly!
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