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-- operator
Hi,
Quick question really... I wanted to 'countif ' with several criteria and found the following on the mr excel boards: =SUMPRODUCT(--(B1:B1000="Chris"),--(C1:C1000="working"),-- (D1:D1000="laptop")) (it counts the rows which have Chris working with a laptop). It worked really well, but I've been unable to find a description of the -- operator? (neither the help nor google have been able to help me so far...) Could anyone enlighten me? Thanks in advance, Chris |
#2
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-- operator
read sumproduct explained
http://www.xldynamic.com/source/xld.SUMPRODUCT.html -- Gary "christian_spaceman" wrote in message ups.com... Hi, Quick question really... I wanted to 'countif ' with several criteria and found the following on the mr excel boards: =SUMPRODUCT(--(B1:B1000="Chris"),--(C1:C1000="working"),-- (D1:D1000="laptop")) (it counts the rows which have Chris working with a laptop). It worked really well, but I've been unable to find a description of the -- operator? (neither the help nor google have been able to help me so far...) Could anyone enlighten me? Thanks in advance, Chris |
#3
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-- operator
-- coerces the boolean values from the tests into 0's (False) and 1's (True).
An alternate way to write the expression would be =SUMPRODUCT((B1:B1000="Chris")*(C1:C1000="working" )*(D1:D1000="laptop")) I prefer this approach, because it more readily generalizes to more complicated conditions. "*" corresponds exactly to a logical AND, "+" corresponds (sort of) to a logical OR, and you can add parentheses appropriately to control the order of evaluation. I say that "+" only "sort of" corresponds to OR, because TRUE+TRUE = 2 instead of 1, so you may need to convert back to an array of 0|1 values (such as wrapping the expression in the SIGN function). Jerry "christian_spaceman" wrote: Hi, Quick question really... I wanted to 'countif ' with several criteria and found the following on the mr excel boards: =SUMPRODUCT(--(B1:B1000="Chris"),--(C1:C1000="working"),-- (D1:D1000="laptop")) (it counts the rows which have Chris working with a laptop). It worked really well, but I've been unable to find a description of the -- operator? (neither the help nor google have been able to help me so far...) Could anyone enlighten me? Thanks in advance, Chris |
#4
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-- operator
Thanks guys - much appreciated.
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#5
Posted to microsoft.public.excel.programming
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-- operator
Thanks guys - much appreciated.
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