我想知道爲什麼我不能使用這個功能？

Question

yahoo<-function(sym,current = TRUE, a=0,b=1,c=2000,d,e,f,g="d") 
{ 
    if(current){ 
    f<-as.numeric(substr(as.character(Sys.time()),start = 1,stop = 4)) 
    d<-as.numeric(substr(as.character(Sys.time()),start = 6,stop = 7))-1 
    e<-as.numeric(substr(as.character(Sys.time()),start = 9,stop = 10)) 
} 
    require(data.table) 
    tryCatch(
    suppressWarnings(
    fread(paste0("http://ichart.yahoo.com/table.csv", 
        "?s=",sym, 
        "&a=",a, 
        "&b=",b, 
        "&c=",c, 
        "&d=",d, 
        "&e=",e, 
        "&f=",f, 
        "&g=",g, 
        "&ignore=.csv"),sep=",")), 
    error = function(e) NULL 
) 
} 

當我運行谷歌< -yahoo（ 「GOOG」），這是我收到的消息：

試圖URL 'http://ichart.yahoo.com/table.csv?s=GOOG&a=0&b=1&c=2000&d=8&e=13&f=2017&g=d&ignore=.csv' 內容類型「text/html的; charset = utf-8'length unknown 已下載1078字節

那麼如何更改該功能使其工作？

Answer 1

此代碼不工作，因爲the Yahoo Finance web service which you're trying to access was discontinued in May 2017。您需要爲這些數據找到其他來源。