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This is a beginner's question.
What's the difference between ^ and **? For example:
2 ^ 10 [1] 1024 2 ** 10 [1] 1024 Is there a function such as power(x,y)?
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In R, for the calculation of power we can simply use power operator ^ and this will be also used in case of generating a power sequence. For example, if we want to generate a power sequence from 1 to 5 of 2 then we can use the code 2^(1:5) this will result 2 4 8 16 32.
Answer: Anything to the power of 1 equals the number itself. Let's solve this question step by step. Explanation: According to the exponent rule, any number raised to the power of one equals the number itself.
1: No difference. It is kept around to allow old S-code to continue to function. This is documented a "Note" in ?Math?Arithmetic
2: Yes: But you already know it:
`^`(x,y) #[1] 1024 In R the mathematical operators are really functions that the parser takes care of rearranging arguments and function names for you to simulate ordinary mathematical infix notation. Also documented at ?Math.
Edit: Let me add that knowing how R handles infix operators (i.e. two argument functions) is very important in understanding the use of the foundational infix "[[" and "["-functions as (functional) second arguments to lapply and sapply:
> sapply( list( list(1,2,3), list(4,3,6) ), "[[", 1) [1] 1 4 > firsts <- function(lis) sapply(lis, "[[", 1) > firsts( list( list(1,2,3), list(4,3,6) ) ) [1] 1 4 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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