Here's a more extensive explanation by Bob Philips:

http://www.xldynamic.com/source/xld.SUMPRODUCT.html


--
HTH,

RD

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"Teodomiro" wrote
in message ...

Carim Wrote:
To put it simply, Sumproduct() is a function which ignores alphabetic
cells,
the operator -- ( called Unary Minus ) transforms alpahabetic cells
into numbers : 0 and 1, thus allowing combination with all other
numeric cells ...

Hope this clarifies
Carim

I had never encountered this problem before. I discovered Sumproduct
he http://www.excel-vba.com/e-formula-sumproduct.htm

He uses an asterisk in place of the comma, like this:
=SUMPRODUCT((A1:B10=C1)*(B1:B10)). This works just fine. I understand
the use of the double negative above, but I don't see why using the
asterisk would alleviate that problem. Can someone explain what's
going on there?


--
Teodomiro


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