I want to expand a dataframe a from this :
<code>data.frame(a = c(1,2,3),b = c(1,2,3))
a b
1 1 1
2 2 2
3 3 3
</code>
<code>data.frame(a = c(1,2,3),b = c(1,2,3))
a b
1 1 1
2 2 2
3 3 3
</code>
data.frame(a = c(1,2,3),b = c(1,2,3))
a b
1 1 1
2 2 2
3 3 3
to this
<code>data.frame(a = c(1,2,3),b = c(1,2,3), c = c(x,x,x))
a b c
1 1 1 x
2 2 2 x
3 3 3 x
</code>
<code>data.frame(a = c(1,2,3),b = c(1,2,3), c = c(x,x,x))
a b c
1 1 1 x
2 2 2 x
3 3 3 x
</code>
data.frame(a = c(1,2,3),b = c(1,2,3), c = c(x,x,x))
a b c
1 1 1 x
2 2 2 x
3 3 3 x
is there a comand to add the row?
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