I have a large complex spreadsheet that calculates just when the file is
saved. I was wondering if anyone new how to ensure that the same number
is not entered twice into a column other than using the find command.
Ryabn


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RJ31
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Here are 2 formula's that will both work (Array formulas so commit with
CTRL+SHIFT+ENTER):

1) =SUMPRODUCT(IF(COUNTIF(A1:A20,A1:A20)1,1,0))
2) =SUMPRODUCT(IF(COUNTIF(A1:A20,A1:A20)1,1,0)/COUNTIF(A1:A20,A1:A20))

#1 will count the total number of duplicates, so 1,1,2,3,4,5,5,5 will return 5
#2 will count the total number of UNIQUE duplicates, so 1,1,2,3,4,5,5, will
return 2

Both formulas will return 0 if there are no duplicates.

Just change the A1:A20 reference to match your data.
Does that help?
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Regards,
Dave


"RJ31" wrote:


I have a large complex spreadsheet that calculates just when the file is
saved. I was wondering if anyone new how to ensure that the same number
is not entered twice into a column other than using the find command.
Ryabn


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RJ31
------------------------------------------------------------------------
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Check out Chip Pearson's site for method of preventing duplicate entries.

http://www.cpearson.com/excel/NoDupEntry.htm


Gord Dibben MS Excel MVP

On Fri, 13 Jan 2006 10:51:18 -0600, RJ31
wrote:


I have a large complex spreadsheet that calculates just when the file is
saved. I was wondering if anyone new how to ensure that the same number
is not entered twice into a column other than using the find command.
Ryabn

Thanks for the replies. I am a coop student starting my first week.
This helped very much. Thank you


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