[R] R - PLOT - X-AXIS - DECIMALS

[statup r]

I have a test.csv with two fields "year" and "sale", with below values:

year   sale
2001    1002002    200

This is what I did in R.

>aaa<-read.csv("test.csv")

>plot(aaa)


But when I call the above plot function why I'm getting decimals in x-axis
(year) ex: 2001.0, 2002.05

Please help.

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