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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