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r - 如何使用函数中包含的列表

问题描述

我敢肯定这是糟糕的功能设计，但这里......

我有一个函数可以将一些术语映射到其他一些术语。细节在这里不相关。

在函数中，我有一个字符列表。我想将此列表用于不同的目的。如何引用函数中包含的列表？

例如：

TermMapping<-function(param){



###The list I want to refer to
 tofind <-
    paste(
      c(
        "Ascending","Descending","Sigmoid","Rectum","Transverse",
        "Caecum","Splenic","Ileum","Rectosigmoid",
        "Ileocaecal","Hepatic","Colon","Terminal","Terminal Ileum",
        "Ileoanal","Prepouch","Pouch","Anastomosis",
        "Stomach","Antrum","Duodenum","Oesophagus","GOJ"
      ),
      collapse = "|"
    )

###something done to param here- details not included but it uses the list above.....


return(dataframe)
}

标签： r

解决方案

我能想到的两个选择：

  1. 如果您需要该列表用于多种用途，为什么它在函数内部？您可以在函数外部定义列表（可能作为自己的函数），然后将列表作为参数传递。

  2. 您可以将列表作为函数的一部分返回。您的函数返回dataframe，因此您可以更改返回值以返回 df 和列表。

    TermMapping<-function(param){



###The list I want to refer to
tofind <-
  paste(
    c(
"Ascending","Descending","Sigmoid","Rectum","Transverse",
"Caecum","Splenic","Ileum","Rectosigmoid",
"Ileocaecal","Hepatic","Colon","Terminal","Terminal Ileum",
"Ileoanal","Prepouch","Pouch","Anastomosis",
"Stomach","Antrum","Duodenum","Oesophagus","GOJ"
),
collapse = "|"
)

###something done to param here- details not included but it uses the list above.....


return(list(my_df = dataframe,
    myList = tofind))
}

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