带有多个函数参数的lapply

Question

library(quantmod)
library(xts)


getSymbols("SY1.DE", from = "2019-4-10", to = "2019-4-19", auto.assign = TRUE)
getSymbols("PEP", from = "2019-4-9", to = "2019-4-19", auto.assign = TRUE)


calcreturn <- function(data, amount = 24) {
  start <- as.numeric(data[,4][1])
  end <- as.numeric(data[,4][nrow(data)])
  difference <- end - start
  winning <- difference * amount
  return(winning)
}



allstocks <- list(SY1.DE, PEP)
amount <- list(24, 23)

lapply(allstocks, calcreturn)

大家好！

这是我用来计算股票回报的代码。但是，我购买的股票数量不同，所以只有在金额参数不变的情况下，lapply才会起作用。有没有一天来处理不断变化的争论？

谢谢!

Answer 1

您可以修改您的lapply，以逐个使用amount对指数进行遍历：

lapply(1:length(allstocks), function(x) calcreturn(allstocks[[x]], amount[[x]]))