[R] How to read a function from keyboard?

[zgu9]

Hi everyone,

I have an R problem about Input.
I want to read an arbitrage function from keyboard. But I don't know how. 
I tried scan(), readLines() but fail to make the output as a function, or a
list that I can use as.function to transform.
Is it possible for R to do so? 

Thank you.
Eric

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