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#1
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--(a1:a4)
What does the syntax in the subject denote? What is the purpose of "--"
(double dash)? |
#2
Posted to microsoft.public.excel.worksheet.functions
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--(a1:a4)
An expression like:
a1:a4=1 will result in an array of 4 true/false elements. so the -- stuff in this expression --(a1:a4=1) will coerce the trues to 1's and the false's to 0's. -true = -1 --true = +1 This syntax is commonly used in array/sumproduct formulas. 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 he http://www.xldynamic.com/source/xld.SUMPRODUCT.html And J.E. McGimpsey has some notes at: http://mcgimpsey.com/excel/formulae/doubleneg.html dcstoo wrote: What does the syntax in the subject denote? What is the purpose of "--" (double dash)? -- Dave Peterson |
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