> ## Save everything to a file
> save.image(file = "mydata.RData")
> rm(y,a,b)
> tail(a)
Error in tail(a) : object 'a' not found
> ## load all objects in this file 
> load("mydata.RData")
> tail(a)
              x         y
95  -0.24481923 0.7426213
96   0.76182545 0.1062928
97  -0.84244952 0.9571641
98   0.03265213 0.3583839
99   0.30548648 0.4523750
100 -0.89662847 0.6953618