Applying some functions to multiple objects

Question

I am on Mac OS 10.10 with R 3.1.1

Suppose I have the following data frames a and b with the same attributes:

a<- structu         


        

Answer 1

It is generally encouraged (by the R Core team memebers) that if you have several data sets that you want to simultaneously operate on, you should keep them all in a list. In order to achieve your goal, you can simply use mget and ls to retreive them from the global environment and then simply replace with first column multiplied by 2, e.g.,

lapply(mget(ls(pattern = "[a-z]")), function(x) x <- x[1] * 2)
# $a
# X1
# 1  2
# 2  4
# 3  6
# 4  8
# 5 10
# 
# $b
# X1
# 1 22
# 2 24
# 3 26
# 4 28
# 5 30