查找所有包含单词“ list”

Question

我想知道是否可以找到包含字符串"list"的所有Base R函数名称？

Answer 1

lsf.str返回特定程序包中的所有函数，然后可以将grep与关键字一起使用并返回与其匹配的所有函数名称。

grep("list", lsf.str("package:base"), value = TRUE)

# [1] "[.Dlist"                 "[.listof"                "[.simple.list"          
# [4] "alist"                   "all.equal.list"          "as.data.frame.list"     
# [7] "as.list"                 "as.list.data.frame"      "as.list.Date"           
#[10] "as.list.default"         "as.list.environment"     "as.list.factor"         
#[13] "as.list.function"        "as.list.numeric_version" "as.list.POSIXct"        
#[16] "as.list.POSIXlt"         "as.pairlist"             "iconvlist"              
#[19] "is.list"                 "is.pairlist"             "list"                   
#[22] "list.dirs"               "list.files"              "list2env"               
#[25] "pairlist"                "print.Dlist"             "print.listof"           
#[28] "print.simple.list"       "sort.list"               "unlist"                 
#[31] "within.list"            

Answer 2

// to save in SharedPreferences in Login private static final String MyPREFERENCES = "MyPreference"; private SharedPreferences sharedPreferences; sharedPreferences = getSharedPreferences(MyPREFERENCES, MODE_PRIVATE); SharedPreferences.Editor editor = getSharedPreferences(MyPREFERENCES, MODE_PRIVATE).edit(); editor.putString("username", "usernameValue"); editor.apply(); //to get data from SharedPreferences in Home Page private static final String MyPREFERENCES = "MyPreference"; private SharedPreferences sharedPreferences; sharedPreferences = getSharedPreferences(MyPREFERENCES, MODE_PRIVATE); String username= SharedPreferences.getString("username", null); 是objects（列表对象）的兄弟功能。

ls

使用objects("package:base", pattern ="list") 和apropos在整个搜索路径中查找对象。