Tutorial :Including variables in expression call in R

I was wondering if it were possible to include variables when using expression in R.

For instance I would like to do something like this:

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

But this does not work, as it prints Î¦₁ - iÎ¦₂ (i.e. it does not substitute i with 1, 2, ... 6

Use substitute:

> substitute(Phi[1] - i* Phi[2], list(i = i))  Phi[1] - 3 * Phi[2]

Looks like it uses the variables. I set x = 1 and used the following.

> p1 = 100  > p2 = 10  > for (i in 1:6)  +     {  +     plot(x, p1-i*p2, main=expression(Phi[1] - i * Phi[2]))  +     }  >

It gave me 6 graphs for Î¦1 - iÎ¦2 with each showing the Y value descending.

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