Hi, I am using the command >sample(c(0,1,2),1,prob=c(0.2,0.3,0.5)) and I have this error notification "Error in sample(c(0,1,2),1,prob=c(0.2,0.3,0.5)): unused argument(s)(1,prob=c(0.2,0.3,0.5)) I don't know what is going wrong. Please give me some suggestions. Thank you Best, Jing