Solved
Invalid variable definition
I definitely defined f(x,beta), but when I try to draw a diagram, the following error occurs.
How can I solve this problem?


Inside the red box, "This variable is not defined. Make sure the label is set correctly."
I definitely defined f(x,beta), but when I try to draw a diagram, the following error occurs.


Inside the red box, "This variable is not defined. Make sure the label is set correctly."
Move your plot under the definition of RFfit(x).
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