Do you really mean sign(x)=0 if x<0? If not (and you meant sign(x)=-1
if x<0), then check XL help for the SIGN function.

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Tushar Mehta
www.tushar-mehta.com
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In article ,
says...
I am trying to define the function sign(x) in Excel. Sign (x) = 1 if x0,
sign(x)=0 if x<0 and sign(0)=0. I know that it is probably straightforward to
do as an if statement, but I wondered if there is just an explicit function
in Excel that would do it for me.