[R] why as.vector can't make x to be a vector?

[????????]

> x=read.table(text="
+   Qtr1 Qtr2 Qtr3 Qtr4
+ 2010  1.8  8.0  6.0  3.0
+ 2011  2.0 11.0  7.0  3.5
+ 2012  2.5 14.0  8.0  4.2
+ 2013  3.0 15.2  9.5  5.0",sep="",header=TRUE)
> x
     Qtr1 Qtr2 Qtr3 Qtr4
2010  1.8  8.0  6.0  3.0
2011  2.0 11.0  7.0  3.5
2012  2.5 14.0  8.0  4.2
2013  3.0 15.2  9.5  5.0
> as.vector(x)
     Qtr1 Qtr2 Qtr3 Qtr4
2010  1.8  8.0  6.0  3.0
2011  2.0 11.0  7.0  3.5
2012  2.5 14.0  8.0  4.2
2013  3.0 15.2  9.5  5.0
> class(as.vector(x))
[1] "data.frame"
        [[alternative HTML version deleted]]

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