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October 30, 2018 01:42
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Recursive function example in R
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| #' Sum of Vector (Recursive Function) | |
| #' A recursive function to find the total sum of all the elements of a vector. | |
| #' Logic: Sum any two elements of the vector. Concatenate this sum to the | |
| #' vector, excluding the elements used to compute the sum. Pass this new vector | |
| #' back into the function (the length should be the original length of the | |
| #' vector minus 1). Terminate the recursion when the length of the vector is 1 | |
| #' (i.e. the total sum). | |
| #' @param n A vector of numbers. | |
| #' @return The sum of the vector. | |
| recursive_add <- function(n) { | |
| if (!is.vector(n) | !is.numeric(n)) | |
| stop("'n' must be a vector.", call. = FALSE) | |
| if (length(n) > 1) { | |
| x <- n[1] + n[2] | |
| n <- c(x, tail(n, n=-2)) | |
| return(recursive_add(n)) | |
| } | |
| return(n) | |
| } | |
| # example | |
| recursive_add(1:10) == sum(1:10) |
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