字符变量作为函数的参数

发布于 2024-10-26 08:40:35 字数 915 浏览 1 评论 0原文

我下载财务数据的代码的一部分：

library(quantmod)

tickers <- c("XOM", "DIS")
stock1 <- getSymbols(tickers[1], from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(tickers[2], from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)             # 'xts' object, merge adjusted close
pair.DF <- data.frame(pair)                              #  data frame

但我想调用这样的函数：

tickers <- function(x, y) {
stock1 <- getSymbols(x, from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(y, from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)            
pair.DF <- data.frame(pair)       
}

然后：

tickers("XOM", "DIS")

或者类似的东西。但我得到的是不好的结果。在这种情况下，“x”和“y”不是数字，而是字符。看起来似乎很容易，但是.. 感谢您的任何建议。

原文

part of my code for downloading financial data:

library(quantmod)

tickers <- c("XOM", "DIS")
stock1 <- getSymbols(tickers[1], from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(tickers[2], from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)             # 'xts' object, merge adjusted close
pair.DF <- data.frame(pair)                              #  data frame

But I want to call function like this:

tickers <- function(x, y) {
stock1 <- getSymbols(x, from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(y, from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)            
pair.DF <- data.frame(pair)       
}

And then:

tickers("XOM", "DIS")

Or something similar. But what I get is bad result. In this case "x" and "y" aren´t numeric, but character.
It seems to be easy, but..
Thanks for any suggestions.

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唠甜嗑 2024-11-02 08:40:35

tickers <- function(x, y) {
stock1 <- getSymbols(x, from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(y, from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)            
pair.DF <- data.frame(pair)       
return(pair.DF)
}

只要你最后返回pair.DF，我就可以工作。这是你的问题吗？

我不认为字符类是问题所在：

class(tickers[1])==class("XOM")
TRUE

tickers <- function(x, y) {
stock1 <- getSymbols(x, from="2010-03-01", to="2011-02-28", auto.assign=F)
stock2 <- getSymbols(y, from="2010-03-01", to="2011-02-28", auto.assign=F)

pair <- merge(Ad(stock1), Ad(stock2), all=F)            
pair.DF <- data.frame(pair)       
return(pair.DF)
}

Works for me as long as you return the pair.DF at the end. Is that your problem?

I don't think the character class is the problem: