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- contrast=list("1"="profit")
- input=readline("please input")
- please input1
- input
- [1] "1"
- class(input)
- [1] "character"
- contrast[[input]]
- [1] "profit"
- contrast$"1"
- [1] "profit"
- contrast$input
- NULL
- eval(input)
- [1] "1"
- contrast$(eval(input))
- Error: unexpected '(' in "contrast$("
- contrast$eval(input)
- Error: attempt to apply non-function
- eval(paste(input))
- [1] "1"
- class(eval(paste(input)))
- [1] "character"
- contrast$eval(paste(input))
- Error: attempt to apply non-function
- contrast$(eval(paste(input)))
- Error: unexpected '(' in "contrast$("
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