Hello Group, I am experimenting with parallel processing ... here is part of my code. require(snow) require(doSNOW) require(foreach) cl.tmp = makeCluster(rep("localhost",4), type="SOCK") registerDoSNOW(cl.tmp) foreach(i=1:NROW(sDat),.packages="gdata",.verbose=TRUE) %dopar% { do something 1 do something 2 do something 3 } I ran this individually without a parallel setup and it works perfectly Now when I do the parallel invocation the error being thrown is that the functions which I created are not being passed to the parallel instances. do something 1,2,3 above use my functions which I created in the code itself. Is there someway that I can have then pass to the parallel routines? Is this the right approach? Thanks and have a nice weekend. S