[R] plotting a function

[Jin]

Hello Dear,

I am trying to plot a function to see a minimum point (actually, using
"optim"). For example,

1. y=f(x)
2. x has a range
3. plot(x,y) to see a point x minimizing y

I tried "plot(x,y)", but it made an error. Am I doing a right way?

Thanks,

Jin
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