[R] Average curve in R

[QAMAR MUHAMMAD UZAIR]

Dear R users,

I have weekly data in the following manner

[,1]	[,2]	[,3]	[,4]
6	2	2	2
5	4	4	3
6	35	2	13
7	32	3	5
4	4	423	3
3	6	4	5
5	6	5	3

I drew curve of each column against days (1,2,3,4,5,6,7). 
Now I want to draw an average curve (a representative 
curve) of the whole data. Is there a way in R to perform 
such operation? please reply ASAP as i have an assignment 
to submit on monday.
Thanks in Advance..
regards