# Color alternate excel rows based on duplicate numbering system.

Hello Experts.

I have a Excel 2003 spreadsheet.  In Column A I have the numbering system below which will go beyond 150 by the end of the year.  I would like to use something like conditional formatting so each new number sequence is an alternate color (grey/white) across to Column AO. (Color in bracket for emphasis only)

1_2013 (white)
2_2013 (Grey)
2_2013 (Grey)
2_2013 (Grey)
2_2013 (Grey)
3_2013 (White)
4_2013 (Grey)
5_2013 (White)
6_2013 (Grey)
7_2013 (White)
7_2013 (White)
8_2013 (Grey)

etc, etc, etc

As soon as the number is entered, it colors that row to the alternate color to Column AO

Matt
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Commented:
Is it easy to extract a sequential number from column AO?
eg left(AO1,find("_",AO1)-1)

If so, you can use an even/odd formula in your conditional formatting.

I don't have Excel 2003, but in 2010, I can use the following formulae and have the two formulae covering the same range giving alternate colours as you specified.

=MOD(LEFT(\$A01,FIND("_",\$A01)-1),2)=0
=MOD(LEFT(\$A01,FIND("_",\$A01)-1),2)=1

If it's not easy to get a sequential number, then you could introduce a hidden column that checks AO34 against AO33 as follows:

=IF(A03=A02,B02,IF(B02="White","Grey","White"))

And then use column BO to determine the colour you want.
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Author Commented:
Thanks Beneford

I added your sequential suggestion to AP (given AO has data in it)

I did some more research based on your suggestion and found the following worked for 2003, coloring based on an even or odd number.

=AND(MOD(\$AP2,2)=0,\$AP2<>"")
=AND(MOD(\$AP2,2)=1,\$AP2<>"")

Worked like a charm, much appreciated.

Matt
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