On Sun, 2011-08-28 at 14:54 +0800, 该走了 wrote: > registerDoMC( core = 4 ) your first problem is that the parameter is 'cores' registerDoMC(cores=4) or registerDoMC(4) -- Brian G. Peterson http://braverock.com/brian/ Ph: 773-459-4973 IM: bgpbraverock