Including variables in expression call in R -

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I was thinking that it is possible to include variables while using the expression in R.

For example, I would like to do something like this: 

  for par (mfrow = c (2,3)) (i 1: 6) {plot ( X, p1 -i * p2, main = expression (Phi [1] - i * phi [2])}}

but it does not work because it prints & Phi ; 1 - i & phi; 2 (i.e. it i with 1, 2, ... 6

Use the option: 

  & gt; Option (Phi [1] - i * phi [2], list (i = i) fee [1] - 3 * fee [2]

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