我有一个向量，其元素包含多个数字。 如何对每个元素中的数字求和并创建新的向量？

Question

I have a vector of class 'factor' like:

vec <-c("1,1,1,1,1,2","2,1,2","3,3,4")

And I want to get another vector like this:

sumvec <- c(7, 5, 10)

How do I do this? I am using R.

Answer 1

Try this:

> sapply(strsplit(as.character(vec), ","), function(x) sum(as.numeric(x)))
[1]  7  5 10

The basic idea is to split the character vector, extract the numeric values, and calculate the sum. strsplit doesn't work on factors, so if you actually have factors, you'll need to convert them to characters first. Similarly, sum won't work on the resulting characters, so you need to convert that to numeric first.