Question

我有一个存储金额的数据框，看起来像这样

> a
  cost
1 1e+05
2 2e+05

我希望它可以显示为

> a  
  cost
1 $100,000
2 $200,000

如何在R？

中做到这一点

Answer 1

DF <- data.frame(cost=c(1e4, 2e5))

#assign a class    
class(DF$cost) <- c("money", class(DF$cost))

#S3 print method for the class    
print.money <- function(x, ...) {
  print.default(paste0("$", formatC(as.numeric(x), format="f", digits=2, big.mark=",")))
}

#format method, which is necessary for formating in a data.frame   
format.money  <- function(x, ...) {
  paste0("$", formatC(as.numeric(x), format="f", digits=2, big.mark=","))
}

DF
#         cost
#1  $10,000.00
#2 $200,000.00

Answer 2

这将为您提供除逗号之外的所有内容：

> sprintf("$%.2f", seq(100,100000,by=10000)/7)
 [1] "$14.29"    "$1442.86"  "$2871.43"  "$4300.00"  "$5728.57"  "$7157.14"  "$8585.71"  "$10014.29" "$11442.86" "$12871.43"

获取这些内容非常复杂，如以下问题所示：

幸运的是，这是在scales package：

中实现的

library('scales')
> dollar_format()(c(100, 0.23, 1.456565, 2e3))
## [1] "$100.00"   "$0.23"     "$1.46"     "$2,000.00"
> dollar_format()(c(1:10 * 10))
## [1] "$10"  "$20"  "$30"  "$40"  "$50"  "$60"  "$70"  "$80"  "$90"  "$100"
> dollar(c(100, 0.23, 1.456565, 2e3))
## [1] "$100.00"   "$0.23"     "$1.46"     "$2,000.00"
> dollar(c(1:10 * 10))
## [1] "$10"  "$20"  "$30"  "$40"  "$50"  "$60"  "$70"  "$80"  "$90"  "$100"
> dollar(10^(1:8))
## [1] "$10"          "$100"         "$1,000"       "$10,000"      "$100,000"     "$1,000,000"   "$10,000,000"  "$100,000,000"

Answer 3

您可以使用currency()包中的formattable功能。用OP的例子

a <- data.frame(cost = c(1e+05, 2e+05))
a

   cost
1 1e+05
2 2e+05

library(formattable)
a$cost <- currency(a$cost, digits = 0L)
a

      cost
1 $100,000
2 $200,000

默认情况下，显示小数点后2位数。这已经被digits参数推翻，以满足OP的期望。

formattable的好处是即使附加了格式，数字仍然是数字，例如，

a$cost2 <- 2 * a$cost
a

      cost    cost2
1 $100,000 $200,000
2 $200,000 $400,000

Answer 4

一种非常简单的方法是

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注释

用library(priceR) values <- c(1e5, 2e5) format_dollars(values) # [1] "$100,000" "$200,000"添加小数位，即 format_dollars(values, 2)
对于其他货币，请使用"$100,000.00" "$200,000.00"，它给出format_currency(values, "€")等

用典型的美元金额格式表示数值

4 个答案:

注释