[R] how to let R read different equations I write and execute it?

[czqiu]

Hello All,
I am a newcomer to R. Currently, I am trying to write an interactive code in
R to let it read the equation which I write and execute the equation in a
curve function.

For example: I want to plot curve by using: curve (equation, -2,2, n=1000)
what I want is that the R code ask me what equation I want to use (which I
know how to write this code):
then, I type for example 3*x.

then 3*x will be assigned to the 'equation' (I don't know how to do this
step)
then curve function will work to plot.

but I dont' know how I can let the equation to be read in and assigned to
equation.
I know how to do this kind of thing for numerical values but not for logical
equations.

Anyone can help out?

thanks a lot!
czqiu
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