Dear Experts, I have a one more doubt about making list of lists. Here is the simple code i have made. I am doing the following for only one digit=20 a=vector(20,mode="list") b=vector(20,mode="list") for (i in 1:20){ #Do Calculation a[[i]]=data.frame(####) b[[i]]=data.frame(####) } Now i have to repeat the whole process for Digits=c(30,40,50,60) In short I want the Master list containing following List 1(#20) List a List b List 2(#30) List a List b ........so on Can you please guide me in this ? Thank you very much. Sincerely -- Munjal [[alternative HTML version deleted]]