Find all functions in that call supplied functions.
find_uses(envs, funs, match_any = TRUE)names(find_uses("package:base", "sum"))
#> [1] "[.numeric_version" "[<-.data.frame"
#> [3] "[[<-.data.frame" "all.equal.character"
#> [5] "all.equal.factor" "all.equal.numeric"
#> [7] "all.equal.raw" "as.numeric_version"
#> [9] "attach" "getDLLRegisteredRoutines.character"
#> [11] "margin.table" "marginSums"
#> [13] "merge.data.frame" "namespaceExport"
#> [15] "namespaceImportMethods" "path.package"
#> [17] "print.summary.warnings" "prop.table"
#> [19] "proportions" "rank"
#> [21] "registerS3methods" "save"
#> [23] "scale.default" "sort.int"
#> [25] "strwrap" "summary.default"
#> [27] "summary.factor" "summary.table"
#> [29] "write.dcf"
envs <- c("package:base", "package:utils", "package:stats")
funs <- c("match.call", "sys.call")
find_uses(envs, funs)
#> $`[.data.frame`
#> [1] "<-" "-" "!" "&&"
#> [5] "%in%" "sys.call" "isS4" "<"
#> [9] "is.matrix" "as.matrix" "character" "anyNA"
#> [13] "NextMethod" "anyDuplicated" "attr" "oldClass"
#> [17] "length" ".subset" "vector" "pmatch"
#> [21] "dim" "for" ">" "("
#> [25] "as.character"
#>
#> $`[<-.data.frame`
#> [1] "if" "all" "names" "c"
#> [5] "<-" "==" "&&" "is.null"
#> [9] "[" "is.numeric" "ncol" "prod"
#> [13] "tryCatch" "stop" "order" "!="
#> [17] "<" "is.logical" ">" "nrow"
#> [21] "seq_len" "+" "oldClass" ".row_names_info"
#> [25] "is.character" "match" "seq.int" "max"
#> [29] "inherits" "|" "any" "min"
#> [33] "is.list" "&" "class<-" "list"
#> [37] "sprintf" "*" "split" "unclass"
#> [41] "attributes" "make.unique"
#>
#> $`[[.data.frame`
#> [1] "<-"
#> [2] "nargs"
#> [3] "missing"
#> [4] "all"
#> [5] "names"
#> [6] "c"
#> [7] "<"
#> [8] "function(x, i, exact) if (is.matrix(i)) as.matrix(x)[[i]] else .subset2(x, i, exact = exact)"
#> [9] "is.character"
#> [10] "row.names"
#>
#> $`[[<-.data.frame`
#> [1] "if" "all" "names" "c" "<-"
#> [6] "class" "&&" "is.null" "nargs" "NROW"
#> [11] "stop" "ngettext" "==" "<=" "rep"
#> [16] "[" "make.unique" "||" "attr" "match"
#> [21] "is.na" "+" "max" "inherits" "|"
#> [26] "any" "anyNA" "is.logical" "seq_along"
#>
#> $alist
#> [1] "as.list" "-"
#>
#> $autoload
#> [1] "{" "&&" "exists" "<-" "[[" "eval"
#> [7] "as.call" "$" "match" "do.call" "invisible"
#>
#> $autoloader
#> [1] "{" "paste0" "match.call" "[["
#> [5] "eval" "match" "if" "as.environment"
#> [9] "gettextf"
#>
#> $by.data.frame
#> [1] "{" "inherits" ".formula2varlist" "is.list"
#> [5] "names" "deparse" "function" "nrow"
#> [9] "eval" "seq_len"
#>
#> $by.default
#> [1] "{" "as.data.frame" "length" "by"
#> [5] "is.list" "names" "deparse" "function"
#> [9] "nrow" "eval" "seq_len"
#>
#> $chkDots
#> [1] "if" "...length" "sprintf" "paste" "sys.call" "sQuote"
#>
#> $diag
#> [1] "{" "is.matrix" ">" "(" "any" "names"
#> [7] "c" "==" "min" "return" "typeof" "+"
#> [13] ":" "dimnames" "!" "identical" "seq_len" "!="
#> [19] "missing" ".Internal"
#>
#> $find.package
#> [1] "if" "is.null" "return"
#> [4] "==" "%in%" "file.path"
#> [7] ".packages" ".libPaths" "["
#> [10] "isNamespaceLoaded" ".getNamespaceInfo" "next"
#> [13] "$" "lapply" "tryCatch"
#> [16] "read.dcf" "inherits" "!="
#> [19] "do.call" "apply" "grepl"
#> [22] "warning" "sQuote" "dQuote"
#> [25] "packageNotFoundError"
#>
#> $library
#> [1] "<-" "if" "switch"
#> [4] "c" "gettextf" "!"
#> [7] "isTRUE" "missing" "&&"
#> [10] "function" "as.numeric_version" "getRversion"
#> [13] "for" "do.call" "[["
#> [16] "as.character" "nzchar" "file.exists"
#> [19] ".getNamespace" "asNamespace" "any"
#> [22] "names" "which" "["
#> [25] "!=" "%in%" "-"
#> [28] "vector" "same.isFn" "TRAFO"
#> [31] "not.Ident" "setdiff" "sort"
#> [34] "errorCondition" "message" "dir.exists"
#> [37] "||" "paste0" "packageNotFoundError"
#> [40] "gettext" "normalizePath" "system.file"
#> [43] "testRversion" "dynGet" "union"
#> [46] "conflictRules" "getNamespaceVersion" "unloadNamespace"
#> [49] "deparse" "attr" "attachNamespace"
#> [52] "detach" "checkNoGenerics" "invisible"
#> [55] "basename" "try" "inherits"
#> [58] "+" "nchar" "nrow"
#> [61] "rep.int" "ifelse" "readDocFile"
#> [64] "matrix" "rbind" "sprintf"
#>
#> $loadNamespace
#> [1] "<-" "[["
#> [3] "dynGet" "match"
#> [5] "sQuote" "c"
#> [7] "!" "&&"
#> [9] "do.call" "as.numeric_version"
#> [11] "Sys.getenv" "%in%"
#> [13] "is.na" "message"
#> [15] "function" "fun"
#> [17] "[" "conditionCall"
#> [19] "getHook" "for"
#> [21] "new.env" "as.name"
#> [23] "$" "normalizePath"
#> [25] "matrix" "asNamespace"
#> [27] "getNamespaceName" "parent.env"
#> [29] "file.exists" "bindtextdomain"
#> [31] "length" "getDLLRegisteredRoutines.DLLInfo"
#> [33] "exists" "<<-"
#> [35] "seq_along" "!="
#> [37] "find.package" "sys.call"
#> [39] "bindTranslations" "basename"
#> [41] "structure" "readRDS"
#> [43] "<" "any"
#> [45] "tools" "path.expand"
#> [47] "readLines" "readline"
#> [49] "utils" "dir.create"
#> [51] "isTRUE" "checkLicense"
#> [53] "||" "makeNamespace"
#> [55] "is.character" ".libPaths"
#> [57] "namespaceImportClasses" "strsplit"
#> [59] "sys.source" "registerS3methods"
#> [61] "assignNativeRoutines" "Sys.setenv"
#> [63] "runHook" ".isMethodsDispatchOn"
#> [65] ":::" ".hasS4MetaData"
#> [67] "-" "getClasses"
#> [69] "unlist" "classMetaName"
#> [71] "sort" "get"
#> [73] "ngettext" ".TableMetaPrefix"
#> [75] "getFunction" "grep"
#> [77] "sealNamespace"
#>
#> $message
#> [1] "<-" "&&" "...length" ">"
#> [5] "warning" "sys.call" "function" "conditionMessage"
#> [9] "withRestarts" "defaultHandler"
#>
#> $packageStartupMessage
#> [1] "<-" ".makeMessage" ".packageStartupMessage"
#>
#> $remove
#> [1] "{" "...length" "$" "!" "vapply"
#> [6] "||" "is.character" ".Primitive" ".Internal"
#>
#> $rm
#> [1] "{" "...length" "$" "!" "vapply"
#> [6] "||" "is.character" ".Primitive" ".Internal"
#>
#> $stopifnot
#> [1] "{" "<-" "...length" "if"
#> [5] "||" "(" "!" "missing"
#> [9] "&&" "stop" "isTRUE" "parent.frame"
#> [13] "isFALSE" "is.environment" "is.call" "substitute"
#> [17] "[[" "is.symbol" "==" "quote"
#> [21] "as.call" "c" "as.expression" "names"
#> [25] "return" "eval" "function" "deparse"
#> [29] ">" "length" "paste" "["
#> [33] "seq_len" "<" "max" "+"
#> [37] "min" "head" "for" "...elt"
#> [41] "is.logical" "anyNA" "all" "match.call"
#> [45] "-" "is.null" "nzchar" "identical"
#> [49] "pmatch" "sprintf" "gettext" "Dparse"
#> [53] "abbrev" "ngettext" "simpleError" "sys.parent"
#> [57] "sys.call" "invisible"
#>
#> $trace
#> [1] "if" ">" "!" "<-"
#> [5] "loadNamespace" "message" "==" ".primTrace"
#> [9] "on.exit" "[[" ":::" "eval.parent"
#>
#> $try
#> [1] "tryCatch" "<-" "if" "is.null" "[[" "sys.call"
#> [7] "deparse" "strsplit" "+" "[" ">" ".Internal"
#> [13] "isTRUE" "cat" "structure"
#>
#> $untrace
#> [1] "if" ".isMethodsDispatchOn" ".primUntrace"
#> [4] "tracingState" "sys.call" "quote"
#> [7] "$" "eval.parent"
#>
#> $browseVignettes
#> [1] "<-" "tools" "unique" "lapply" "==" "attr" "if"
#> [8] "gettext" "return"
#>
#> $citation
#> [1] "if"
#> [2] "!"
#> [3] "is.logical"
#> [4] "match"
#> [5] "names"
#> [6] "as.list"
#> [7] "is.na"
#> [8] "system.file"
#> [9] "stop"
#> [10] "sys.call"
#> [11] "dirname"
#> [12] "file_test"
#> [13] "gettextf"
#> [14] "return"
#> [15] "("
#> [16] "["
#> [17] "paste0"
#> [18] "sub"
#> [19] "length"
#> [20] "as.vector"
#> [21] "format"
#> [22] "warning"
#> [23] "Filter"
#> [24] "as.person"
#> [25] "paste"
#> [26] "sprintf"
#> [27] ":::"
#> [28] ".get_urls_from_DESCRIPTION_URL_field"
#> [29] "head"
#> [30] "tail"
#>
#> $help
#> [1] "{" "c" "!" "match.arg"
#> [5] "missing" "substitute" "is.null" "interactive"
#> [9] "::" "startDynamicHelp" "return" "$"
#> [13] "as.environment" "browseURL" "invisible" "is.character"
#> [17] "deparse1" "stop" "find.package" "is.logical"
#> [21] "for" ".packages" "match" "nzchar"
#> [25] "unique"
#>
#> $hsearch_db
#> [1] "<-" "$" "is.logical"
#> [4] "as.integer" ".libPaths" "anyNA"
#> [7] "[" ".hsearch_db" "||"
#> [10] "attr" "any" "file.mtime"
#> [13] "Sys.getlocale" "is.na" "message"
#> [16] "character" "for" "file.path"
#> [19] "c" "(" "length"
#> [22] "duplicated" ">=" "on.exit"
#> [25] "ifelse" "dim" "tools"
#> [28] "%%" "setWinProgressBar" "packageNotFoundError"
#> [31] "colnames" "cbind" "gettextf"
#> [34] "warning" "rep.int" "merge_demo_index"
#> [37] "nrow" "list" "rownames"
#> [40] "which" "paste" "unique"
#> [43] "iconv" "lapply" "rowSums"
#> [46] "nzchar" "&" "-"
#> [49] "class"
#>
#> $packageVersion
#> [1] "<-" "packageDescription" "!"
#> [4] "package_version" "packageNotFoundError"
#>
#> $rc.settings
#> [1] "{" "==" "match.call" "unlist" "<-"
#> [6] "&&" "is.logical" "is.na" "missing" "invisible"
#>
#> $write.csv
#> [1] "{" "match.call" "c" "!" "[["
#> [6] "gettextf" "$" "is.logical" "::"
#>
#> $write.csv2
#> [1] "{" "match.call" "c" "!" "[["
#> [6] "gettextf" "$" "is.logical" "::"
#>
#> $HoltWinters
#> [1] "{" "as.ts" "frequency" "&&" "is.null"
#> [6] "==" "c" "|" ">" "is.logical"
#> [11] "-" "*" "ts" "start" "$"
#> [16] ".lm.fit" "seq_along" "length" "function" "as.double"
#> [21] "min" "hw" "warning" "optimize" "structure"
#> [26] "match.call"
#>
#> $SSasymp
#> [1] "{" "-" "(" "+" "[" "c" "all" "array" "list"
#> [10] "attr"
#>
#> $SSasympOff
#> [1] "{" "exp" "(" "as.list" "match.call"
#> [6] "if" "vapply" "length" "dimnames"
#>
#> $SSasympOrig
#> [1] "{" "exp" "*" "as.list" "match.call"
#> [6] "if" "vapply" "length" "dimnames"
#>
#> $SSbiexp
#> [1] "{" "exp" "*" "+" "[" "c" "all" "array" "list"
#> [10] "attr"
#>
#> $SSfol
#> [1] "{" "*" "-" "+" "^" "[" "c" "all" "array"
#> [10] "list" "attr"
#>
#> $SSfpl
#> [1] "{" "-" "/" "as.list" "match.call"
#> [6] "if" "vapply" "array" "list" "*"
#> [11] "attr"
#>
#> $SSgompertz
#> [1] "{" "^" "*" "as.list" "match.call"
#> [6] "if" "vapply" "length" "(" "attr"
#>
#> $SSlogis
#> [1] "{" "-" "/" "as.list" "match.call"
#> [6] "if" "vapply" "array" "list" "*"
#> [11] "attr"
#>
#> $SSmicmen
#> [1] "{" "*" "/" "[" "c" "all"
#> [7] "array" "list" "(" "dimnames"
#>
#> $SSweibull
#> [1] "{" "exp" "-" "*" "[" "c"
#> [7] "all" "array" "list" "dimnames"
#>
#> $StructTS
#> [1] "{" "function" "if" "[" "stop"
#> [6] "return" "c" "+" "rep" ">="
#> [11] "all" "$" "(" "sum" "substitute"
#> [16] "NCOL" "!" "storage.mode" "frequency" "dim"
#> [21] "switch" "makeTrend" "/" "is.null" "optim"
#> [26] "gettextf" "KalmanRun" "dimnames" "pmax" "length"
#> [31] "match.call" "class"
#>
#> $acf
#> [1] "{" "match.arg" "==" "[[" "::"
#> [6] "return" "parent.frame" "substitute" "as.ts" "as.matrix"
#> [11] "is.numeric" "as.integer" "ncol" "is.na" "floor"
#> [16] "(" "log10" "<" "colMeans" "["
#> [21] ".Call" ":" "structure" "colnames" "invisible"
#>
#> $aov
#> [1] "{" "if" "terms" "attr"
#> [5] "length" "sprintf" "match.call" "quote"
#> [9] "is.null" "parent.frame" "c" "oldClass"
#> [13] "pmatch" "function" "options" "+"
#> [17] "paste" "!" "sub" "NROW"
#> [21] "is.matrix" ":" "(" "vector"
#> [25] ".getXlevels" "model.matrix" "model.weights" "*"
#> [29] "qr.qty" "list" "nrow" "%||%"
#> [33] "for" "==" "next" "^"
#> [37] "lm.fit" "class"
#>
#> $ar
#> [1] "{" "switch" "ar.yw" "ar.ols" "$"
#>
#> $ar.mle
#> [1] "{" "is.null" "deparse1" "is.ts" "dim"
#> [6] "na.action" "anyNA" "tsp" "as.vector" "min"
#> [11] "floor" "log10" "<" "matrix" "numeric"
#> [16] "[" "sum" "(" "for" "arima0"
#> [21] "$" ":" "structure" "%*%" "attr"
#> [26] "match.call" "solve" "drop"
#>
#> $ar.ols
#> [1] "{" "is.null" "deparse1" "is.ts" "as.ts"
#> [6] "stop" "frequency" "!" "nrow" "seq_len"
#> [11] "drop" "[" "/" "min" "floor"
#> [16] "log10" "<" "vector" "function" "prod"
#> [21] "$" "^" "colMeans" "for" "embed"
#> [26] "matrix" "%*%" "warning" "break" "solve"
#> [31] "tcrossprod" "numeric" "det" "rbind" "is.finite"
#> [36] "dim" "aperm" "dimnames" "names" "outer"
#> [41] "NROW" "class"
#>
#> $arima
#> [1] "{" "function" "match.arg" "length" "max"
#> [6] "if" "[" "/" "-" "is.null"
#> [11] "upARIMA" "return" "*" "as.double" "which"
#> [16] "c" "all" "polyroot" "rep.int" "Re"
#> [21] "substitute" "stop" "is.numeric" "dim" "||"
#> [26] "is.list" "is.na" "sum" "seq_len" "NROW"
#> [31] "class" "colnames" "cbind" "anyNA" "svd"
#> [36] "diff" "lm" "|" "coef" "<="
#> [41] "%in%" "numeric" "optim" "makeARIMA" "solve"
#> [46] "armafn" "crossprod" "t" "structure"
#>
#> $arima0
#> [1] "{" "function" "[" "-" "which"
#> [6] "c" "!" "all" "Mod" ":"
#> [11] "<" "==" "rep" "Re" "substitute"
#> [16] "stop" "as.ts" "dim" "||" "is.list"
#> [21] "$" "is.na" "sum" "tsp" "*"
#> [26] "class" "(" "colnames" "cbind" "as.matrix"
#> [31] "na.omit" "anyNA" "svd" "lm" "coef"
#> [36] "storage.mode" "on.exit" "maInvert" "names" "gettextf"
#> [41] "solve" "diag" "log"
#>
#> $density.default
#> [1] "{" "if" "!" "<-" "return"
#> [6] "/" "*" "-" "is.numeric" "deparse1"
#> [11] "as.vector" "is.null" "is.na" "[" "all.equal"
#> [16] "as.integer" "is.finite" "all" "warning" ">"
#> [21] "log2" "tolower" "bw.nrd" "bw.bcv" "<="
#> [26] "+" "seq.int" "dnorm" "abs" "fft"
#> [31] "pmax.int" "structure" "$" "match.call"
#>
#> $dist
#> [1] "{" "!" "pmatch" "c" "=="
#> [6] "as.matrix" "list" "dimnames" "match.call"
#>
#> $ecdf
#> [1] "<-" "length" "<" "unique" "/" "tabulate" "class"
#> [8] "assign" "attr"
#>
#> $factanal
#> [1] "{" "function" "attr"
#> [4] "-" "is.null" "^"
#> [7] "%*%" "[" "!"
#> [10] "c" "list" "is.list"
#> [13] "match" "stop" "is.matrix"
#> [16] "inherits" ">" "[["
#> [19] "::" ".check_vars_numeric" "as.matrix"
#> [22] "cov.wt" "&&" "ncol"
#> [25] "(" "ngettext" "/"
#> [28] "...length" "length" "cbind"
#> [31] "runif" "for" "factanal.fit.mle"
#> [34] "cat" "as.vector" "sortLoadings"
#> [37] "do.call" "class" "switch"
#> [40] "napredict" "pchisq"
#>
#> $glm
#> [1] "{" "match.call" "is.character" "parent.frame"
#> [5] "family" "$" "stop" "environment"
#> [9] "c" "[" "quote" "eval"
#> [13] "return" "!" "attr" "=="
#> [17] "dim" "is.empty.model" "matrix" "as.vector"
#> [21] "is.numeric" "<" "!=" "model.extract"
#> [25] ">" "structure" ".getXlevels"
#>
#> $hclust
#> [1] "{"
#> [2] "c"
#> [3] "=="
#> [4] "pmatch"
#> [5] "stop"
#> [6] "-"
#> [7] "attr"
#> [8] "||"
#> [9] "<"
#> [10] "*"
#> [11] "!="
#> [12] "if (length(d) < len) stop else warning"
#> [13] "storage.mode"
#> [14] "integer"
#> [15] "as.double"
#> [16] "structure"
#> [17] "cbind"
#> [18] ":"
#>
#> $integrate
#> [1] "{" "match.fun" "f" "if" "<"
#> [6] "&&" "max" "$" "stopifnot" "length"
#> [11] ".External" "as.double" "-" "c" "+"
#> [16] "match.call"
#>
#> $isoreg
#> [1] "{" "xy.coords" "if" "anyNA" "(" "!"
#> [7] "==" "order" "[" "structure" "list"
#>
#> $line
#> [1] "<-" "complete.cases" "sys.call" ".Call"
#> [5] "["
#>
#> $lm
#> [1] "{" "match.call" "c" "["
#> [5] "[[" "::" "parent.frame" "=="
#> [9] "!=" "gettextf" "model.response" "model.weights"
#> [13] "!" "is.numeric" "model.offset" "nrow"
#> [17] "NROW" "list" "ncol" "*"
#> [21] "-" "lm.fit" "class"
#>
#> $loess
#> [1] "{" "match.arg" "$" "quote"
#> [5] "eval" "if" "return" "model.response"
#> [9] "model.weights" "length" "as.character" "("
#> [13] "any" "stop" "ncol" "colnames"
#> [17] "match" "missing" "switch" "/"
#> [21] "sum" "is.list" "is.numeric"
#>
#> $manova
#> [1] "{" "match.call" "quote" "eval" "if"
#> [6] "for" "!" "class" "oldClass" "$"
#>
#> $nls
#> [1] "{" "as.formula" "if" "!"
#> [5] "is.environment" "match.call" "==" "[["
#> [9] "%||%" "attr" "eval" "is.null"
#> [13] "[" "-" "is.na" "function"
#> [17] "as.name" "any" "paste" "setNames"
#> [21] "gettextf" "sapply" "sprintf" "sum"
#> [25] ">" "diff" "%in%" "new.env"
#> [29] "NROW" "!=" "paste0" "quote"
#> [33] "eval.parent" "model.weights" "<" "list"
#> [37] "nls.control" "nlsModel.plinear" "||" "+"
#> [41] "nls_port_fit" ":" "c" "class"
#>
#> $oneway.test
#> [1] "{" "||" "(" "length" "<-"
#> [6] "paste" "match.call" "eval" "parent.frame" "quote"
#> [11] "attr" "[" "factor" "nlevels" "tapply"
#> [16] "/" "^" "mean" "pf" "names"
#> [21] "class"
#>
#> $plot.stepfun
#> [1] "if" "is.stepfun" "<-" "ecdf" "call"
#> [6] "missing" "%||%" "knots" "range" "length"
#> [11] "*" "median" "abs" "c" "["
#> [16] "<=" "(" "on.exit" "segments" "points"
#> [21] "list"
#>
#> $smooth
#> [1] "{" "!" "stop" "<-" "c"
#> [6] "pmatch" "startsWith" "==" "match" "as.double"
#> [11] "$" "is.null" "||" "ts" "frequency"
#> [16] "["
#>
#> $smooth.spline
#> [1] "{"
#> [2] "list"
#> [3] "getOption"
#> [4] "names"
#> [5] "if"
#> [6] "!"
#> [7] "vapply"
#> [8] "$"
#> [9] "stop"
#> [10] "is.finite"
#> [11] "length"
#> [12] "is.null"
#> [13] "any"
#> [14] "/"
#> [15] "*"
#> [16] ">"
#> [17] "round"
#> [18] "is.unsorted"
#> [19] "function(p) {\n p[p] <- seq_along(p)\n p\n}"
#> [20] "^"
#> [21] "sapply"
#> [22] "split"
#> [23] "unlist"
#> [24] "seq_len"
#> [25] "rm"
#> [26] "as.logical"
#> [27] "warning"
#> [28] "rep"
#> [29] "is.function"
#> [30] "seq.int"
#> [31] "as.double"
#> [32] "as.integer"
#> [33] "integer"
#> [34] "weighted.mean"
#> [35] "[["
#>
#> $stepfun
#> [1] "if" "stop" "length" "+" "approxfun" "-"
#> [7] "c" "sys.call"
#>
#> $stl
#> [1] "{" "function" "if" "%%" "as.integer"
#> [6] "substitute" "<" "stop" "na.action" "is.matrix"
#> [11] "is.na" "<=" "is.character" "deg.check" "nextodd"
#> [16] "/" "-" ".Fortran" "cycle" "["
#> [21] "as.vector" "list" "start" "c"
#>
#> $update.default
#> [1] "{" "is.null" "getCall" "$" "!"
#> [6] "update" "length" "match" "for" "[["
#> [11] "c" "as.call" "parent.frame"
#>
#> $xtabs
#> [1] "{" "&&" "stop" "<-"
#> [5] "inherits" ">" "terms" "is.matrix"
#> [9] "$" "as.data.frame" "[[" "=="
#> [13] "[" "lapply" "is.factor" "as.character"
#> [17] "levels" "is.null" "names" "tapply"
#> [21] "unlist" "dim" "list" "!="
#> [25] "tryCatch" "unique" "is.na" "as.double"
#> [29] "as" "as.integer"
#>