如何将 char 变量中的大数字转换为数值变量？ [复制]

Question

>str(data$Installs)

$ 安装次数：因子 w/ 21 个级别 "","0+","1+","1,000+",..: 8 20 15 18 11 17 17 5 5 8 ...

 db$Installs = as.character(gsub("\\+", "", db$Installs))

 str(db$Installs)
  chr [1:10841] "10,000" "500,000" "5,000,000" "50,000,000" "100,000" "50,000" "50,000" "1,000,000" "1,000,000" "10,000" ...

 db$Installs = as.double(gsub(",","",db$Installs))

 str(db$Installs)
  num [1:10841] 1e+04 5e+05 5e+06 5e+07 1e+05 5e+04 5e+04 1e+06 1e+06 1e+04 ...

我想要这样的变量：

“10000”“500000”“5000000”“50000000”“100000”“50000”“50000”“1000000”“1000000”“10000”...

我试过这段代码

db$Installs.factor <- factor(db$Installs) 
db$Installs = as.character(gsub("\\+", "", db$Installs))
db$Installs = as.double(gsub(",","",db$Installs))

Answer 1

试试这个

输入-

sample <- c("10,000+" ,"500,000+", "5,000,000+", "50,000,000+" ,"100,000+", "50,000+" ,"50,000+" ,"1,000,000+" )

解决方案-

sample <- as.numeric(gsub("\\D", "", sample))

输出-

1]    10000   500000  5000000 50000000   100000    50000    50000  1000000

注意- 如果你想强制 R 不使用指数符号，那么你可以使用 -

options("scipen"=100, "digits"=4)

‘scipen’：整数。决定以固定或指数表示法打印数值时要应用的惩罚。正值偏向固定，负值偏向科学记数法：固定记数法将是首选，除非它比“scipen”数字更宽。