You'll find an example he-
http://www.mcgimpsey.com/excel/formulae/doubleneg.html
--
Regards
Ken....................... Microsoft MVP - Excel
Sys Spec - Win XP Pro / XL 97/00/02/03
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It's easier to beg forgiveness than ask permission :-)
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"Brad" wrote in message
...
There are many formulas that I see that have a "--". What are they used
for,
or how do I ask Excel for help to read more about this topic.
Example
=IF(ISERR(--(A1)),LEFT(A1,MATCH(FALSE,ISNUMBER(--MID(A1,ROW(INDIRECT("1:"&LE
N(A1))),1)),0)-1),A1)