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MS Office Forum / Excel / Worksheet Functions / March 2008Count cells
I have a long table which looks something like this.... 1 4 7 A 1 6 5 D 2 7 4 C 4 8 2 D 3 2 9 A 2 1 4 F 5 6 7 D 1 2 3 A I need a query which counts the number of times "A" appears in the 4th column for every "1" in column 1. In this case the answer would be 2. Try this: =SUMPRODUCT(--(A1:A10&D1:D10="1A")) Is that something you can work with? -------------------------- Regards, Ron Microsoft MVP (Excel) (XL2003, Win XP) >I have a long table which looks something like this.... > 1 4 7 A > 1 6 5 D [quoted text clipped - 7 lines] > I need a query which counts the number of times "A" appears in the 4th > column for every "1" in column 1. In this case the answer would be 2. Works like a charm.... Thanks. Quick question - what does the "--" between two parantheses do ? In this formula: =SUMPRODUCT(--(A1:A10&D1:D10="1A")) this section: (A1:A10&D1:D10="1A") returns a series of boolean (fancy word for: TRUE/FALSE) values ...which are not numeric to Excel. When an arithmetic operator (+,-,*,/) is applied to a boolean value, Excel converts TRUE to 1 and FALSE to 0. The standard convention is to use the Double-Minus (--) to convert the values. It works this way: TRUE=TRUE -TRUE = -1 --TRUE = 1 FALSE = FALSE -FALSE = 0 --FALSE = 0 Now, you could easily use 1*TRUE, but the Dbl-Minus indicates to knowledgable users that you are forcing a conversion and not trying to calculate something. So, In the formula, the TRUE/FALSE values are converted to 1's and 0's by the "--" and the SUMPRODUCT calculates the total. Does that help? -------------------------- Regards, Ron Microsoft MVP (Excel) (XL2003, Win XP) > Works like a charm.... Thanks. > > Quick question - what does the "--" between two parantheses do ? Yes, that helps. Thanks a lot. > In this formula: =SUMPRODUCT(--(A1:A10&D1:D10="1A")) > [quoted text clipped - 35 lines] > > > > Quick question - what does the "--" between two parantheses do ? =SUM(IF(A1:A8=1,(IF(D1:D8="A",1,0)))) > I have a long table which looks something like this.... > [quoted text clipped - 9 lines] > I need a query which counts the number of times "A" appears in the 4th > column for every "1" in column 1. In this case the answer would be 2. I'd use: =sumproduct(--(a1:a10=1),--(d1:d10="A")) Adjust the ranges to match--but you can't use whole columns (except in xl2007). =sumproduct() likes to work with numbers. The -- stuff changes trues and falses to 1's and 0's. Bob Phillips explains =sumproduct() in much more detail here: http://www.xldynamic.com/source/xld.SUMPRODUCT.html And J.E. McGimpsey has some notes at: http://mcgimpsey.com/excel/formulae/doubleneg.html > I have a long table which looks something like this.... > [quoted text clipped - 9 lines] > I need a query which counts the number of times "A" appears in the 4th > column for every "1" in column 1. In this case the answer would be 2.  SignatureDave Peterson |
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