R) data.table(x=letters[1:5],y=rnorm(5),z=LETTERS[1:5])
x y z
1: a 0.5551301186 A
2: b 0.1092535710 B
3: c -2.4319115661 C
4: d 1.6915588561 D
5: e -1.5163715976 E
colNames = c('y','z')
newName = 't'
How do I add a column 't' such that t:=paste(y,x,sep='_')
x y z t
1: a 0.5551301186 A 0.5551301186_A
2: b 0.1092535710 B 0.1092535710_B
3: c -2.4319115661 C ...
4: d 1.6915588561 D ...
5: e -1.5163715976 E ...
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