[R] Defining "x" by names of columns in my dataset

[Julie]

Hello,
I have a question about what I do wrong when I want to define "x" (and then
I plan to define "y" and create a plot of lm(x,y)).

> x <- (di(X.diktator20.), di(X.diktator200.), di (X.diktator2000.),
> di(X.diktator20000.))
Error: unexpected ',' in "x <- (di(X.diktator20.),"
> x <- (di(X.diktator20., X.diktator200., X.diktator2000.,
> X.diktator20000.))
Error: could not find function "di"
> x <- (X.diktator20., X.diktator200., X.diktator2000., X.diktator20000.)
Error: unexpected ',' in "x <- (X.diktator20.,"
> x <- ("X.diktator20.", "X.diktator200.", "X.diktator2000.",
> "X.diktator20000.")
Error: unexpected ',' in "x <- ("X.diktator20.","
> x <- (X.diktator20.,X.diktator200.,X.diktator2000.,X.diktator20000.)
Error: unexpected ',' in "x <- (X.diktator20.,"
> x <- (X.diktator20.;X.diktator200.;X.diktator2000.;X.diktator20000.)
Error: unexpected ';' in "x <- (X.diktator20.;"
> x <- ((X.diktator20.)(X.diktator200.)(X.diktator2000.)(X.diktator20000.))
Error: object 'X.diktator20.' not found
> x <-
> ((di(X.diktator20.))(di(X.diktator200.))(di(X.diktator2000.))(di(X.diktator20000.)))
Error: could not find function "di"

"di" is a name of my dataset, that is defined and it worked when I did round
correlation.
"X.diktator.20." and the other ones are names of the columns, at least they
are shown like that in R. So how could they not exist? 
I tried it several ways, then also without X, X., . at the end and so on,
but it still did not work. I certainly do something wrong, but I haven´t
found it in the help manual yet. Could someone tell me where is my mistake,
please? 
Thank you a lot!

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