Hi John,
Thanks for replying. But i tried <W$=@length>*<W$=@length> and it works. i.e., it returns a number. Also, i set two number attributes var1 & var2 to a component and in the part list tried <W$=@var1>*<W$=@var2> and it returns the product.So, I think it doesn't work only for the wire...