如何从字符串转换为R中的数值

Question

i'm looking to graph the heights of a group of people in R

B/ca height like 5-11 comes in as a string, I was wondering if there were any tips on how to convert to a number so it could be graphed.

Answer 1

I am assuming your data is a factor. If this is correct you can edit all the levels to numeric values then convert the factor to a numeric vector.

levels(data$heights)  #Levels of the factor
levels(data$heights)<-c(5*12+10,5*12+11,6*12,6*12+1) #Renaming factors in numerical make sure
##the numbers are in the same order as in your levels
data$heights<-as.numeric(levels(data$heights))[data$heights]  #Changing factor GPA to numeric vector GPA
data$heights

Reminder that this works if your R read your data as a factor

Answer 2

require(stringr) 
Split <- str_split(x, "-")
sapply(Split, function(x) x[1] + (x[2] / 11))

Answer 3

它也可以与基本R函数一起使用：

sapply(strsplit(x, "-"), function(x) {x <- as.numeric(x); x[1] + x[2] / 12})