[R] Creating dates to plot

[eric]

I have a dataframe that looks like this:

head(x)
  Period      AP             Al                MA             BB                 
All
1 200812  903,231   1,985,460   905,422   3,312,088   7,106,201 
2 200901  880,491   1,924,111   892,980   3,006,050   6,703,631 
3 200902  883,994   1,926,169   890,021   3,247,530   6,947,714 
4 200903  888,021   1,901,182   892,593   3,216,730   6,898,526 
5 200904  869,024   1,829,841   857,723   3,121,458   6,678,046 
6 200905  847,450   1,776,100   847,593   3,110,783   6,581,925 

x$Period is a numeric value that represents the year and month. How would I
take those values and turn them into dates so that I could plot the various
columns vs the date ?



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