Question

从iOS开发中快速休息并尝试使用R实现一个非常简单的任务，但我无法弄清楚如何解决此错误，有人可以帮忙吗？

setClass(
    "Player",
    representation(name="character", position="character", adp="numeric", points="numeric"),
    prototype(name=NA_character_, position=NA_character_, adp=NA_real_, points=NA_real_)
)



setwd("/Applications/MAMP/htdocs/fantasy")
playersADP = read.csv("adp_test.csv",stringsAsFactors=FALSE)
print(nrow(playersADP))

players <- 1:nrow(playersADP)

for(i in 1:nrow(playersADP)) {
    player <- new("Player",
        name = playersADP[i,3],
        position = playersADP[i,4],
        adp = playersADP[i,1]
    )
    players[i] = player
}
print(players)

当我运行上面的脚本时，这是我得到的错误＆＃34;播放器中的错误[i] =播放器：子分配类型中的不兼容类型（从S4到整数）修复＆＃34;

Answer 1

您的问题是阵列无法正常工作。

此行创建一个1到nrow(playersADP)的数组：

players <- 1:nrow(playersADP)   # Gives you [1, 2, 3, ...]

这会创建一个整数数组。这些与S4类型不兼容，因此当您尝试将值设置为S4时，会出现类型问题：

players[i] = player   # Crashes because players is an array of integers, but player is not an integer

你想要的是这个：

players <- c()    # Create an empty array

然后添加到它：

players <- c(players, player)

在R中动态地将对象添加到数组

1 个答案: