[R] How to get to the varable in a list

[Lisa Wang]

Hello,

I have a list "lis" as the following:

$"1"
  x1 x2
4  3  1

$"2"
  x1 x2
3  3  2
5  3  2

$"3"
  x1 x2
2  3  3
6  3  3

How do I get the x1 varible?  for example ss"1"

-------------- next part --------------
This e-mail may contain confidential and/or privileged information for the sole use of the intended recipient. Any review or distribution by anyone other than the person for whom it was originally intended is strictly prohibited. If you have received this e-mail in error, please contact the sender and delete all copies. Opinions, conclusions or other information contained in this e-mail may not be that of the organization.