这是一个开始：在第一个和第二个字母的网格上可视化这些：

combi <- c("Ad", "am", "ar", "as", "bc", "bd", "bp", "br", "BR", "bs", 
"by", "c",  "C",  "cc", "cd", "ch", "ci", "CJ", "ck", "Cl", "cm", "cn", 
"cq", "cs", "Cs", "cv", "d",  "D",  "dc", "dd", "de", "df", "dg", "dn", 
"do", "ds", "dt", "e",  "E",  "el", "ES", "F",  "FF", "fn", "gc", "gl", 
"go", "H",  "Hi", "hm", "I",  "ic", "id", "ID", "if", "IJ", "Im", "In", 
"ip", "is", "J",  "lh", "ll", "lm", "lo", "Lo", "ls", "lu", "m",  "MH", 
"mn", "ms", "N",  "nc", "nd", "nn", "ns", "on", "Op", "P",  "pa", "pf", 
"pi", "Pi", "pm", "pp", "ps", "pt", "q",  "qf", "qq", "qr", "qt", "r",  
"Re", "rf", "rk", "rl", "rm", "rt", "s",  "sc", "sd", "SJ", "sn", "sp", 
"ss", "t",  "T",  "te", "tr", "ts", "tt", "tz", "ug", "UG", "UN", "V",  
"VA", "Vd", "vi", "Vo", "w",  "W",  "y")

df <- data.frame (first = factor (gsub ("^(.).", "\\1", combi), 
                                  levels = c (LETTERS, letters)),
                  second = factor (gsub ("^.", "", combi), 
                                  levels = c (LETTERS, letters)),
                  combi = combi))

library(ggplot2)
ggplot (data = df, aes (x = first, y = second)) + 
   geom_text (aes (label = combi), size = 3) + 
   ## geom_point () +
   geom_vline (x = 26.5, col = "grey") + 
   geom_hline (y = 26.5, col = "grey")

（是：）

ggplot (data = df, aes (x = second)) + geom_histogram ()

ggplot (data = df, aes (x = first)) + geom_histogram ()

我收集：

• 一个字母的名字，

  • 幸运的是i, j, k, 和l可用（所以我最多可以索引 4d 数组）
  • 不幸的是t（时间），c（浓度）都没有了。m（质量）、V（体积）和F（力）也是如此。没有半径r也没有直径d。
  • 不过，我可以有压力 ( p)、物质量 ( n) 和长度l。

  • 也许我必须改成希腊名字：ε可以，但不应该

    π <- pi
    

    ?

• 我可以有任何lowerUPPER我想要的名字。

• 一般来说，以大写字母开头比小写字母更安全。

• 不要以c或开头d

好的，这是我基于 SO 问题和其他人的评论对类似“周期表”的可视化的快速看法。主要问题是包之间的变量数量差异很大，这会阻碍可视化......我意识到这很粗糙，所以请随意更改。

这是当前输出（来自我的包列表）

和代码

# Load all the installed packages
lapply(rownames(installed.packages()), require, 
       character.only = TRUE)
# Find variables of length 1 or 2
one_or_two <- unique(apropos("^[a-zA-Z]{1,2}$"))
# Find which package they come from
packages <- lapply(one_or_two, find)
# Some of the variables may belong to multiple packages, so determine the length 
# of each entry in packages and duplicate the names accordingly
lengths <- unlist(lapply(packages, length))
var.data <- data.frame(var = rep(one_or_two, lengths), 
                   package = unlist(packages))

现在，我们有一个这样的数据框：

> head(var.data, 10)
   var           package
1   ar     package:stats
2   as   package:methods
3   BD    package:fields
4   bs      package:VGAM
5   bs   package:splines
6   by      package:base
7    c      package:base
8    C     package:stats
9   cm package:grDevices
10   D     package:stats

我们现在可以按包拆分数据

 data.split <- split(var.data, var.data$package)

我们可以看到大部分变量来自base和stats包

> unlist(lapply(data.split, nrow))
     package:base  package:datasets    package:fields 
               16                 1                 2 
  package:ggplot2 package:grDevices  package:gWidgets 
                2                 1                 1 
  package:lattice      package:MASS    package:Matrix 
                1                 1                 3 
  package:methods      package:mgcv      package:plyr 
                3                 2                 1 
     package:spam   package:splines     package:stats 
                1                 2                14 
 package:survival     package:utils      package:VGAM 
                1                 2                 4 

最后，绘图例程

plot(0, 0, "n", xlim=c(0, 100), ylim=c(0, 120), 
     xaxt="n", yaxt="n", xlab="", ylab="")

side.len.x <- 100 / length(data.split)
side.len.y <- 100 / max(unlist(lapply(data.split, nrow)))
colors <- rainbow(length(data.split), start=0.2, end=0.6)    

for (xcnt in 1:length(data.split))
    {
    posx <- side.len.x * (xcnt-1)

    # Remove "package :" in front of the package name
    pkg <- unlist(strsplit(as.character(data.split[[xcnt]]$package[1]), ":"))
    pkg <- pkg[2]

    # Write the package name
    text(posx + side.len.x/2, 102, pkg, srt=90, cex=0.95, adj=c(0, 0))

    for (ycnt in 1:nrow(data.split[[xcnt]]))
        {
        posy <- side.len.y * (ycnt-1)
        rect(posx, posy, posx+side.len.x*0.85, posy+side.len.y*0.9, col = colors[xcnt])
        text(posx+side.len.x/2, posy+side.len.y/2, data.split[[xcnt]]$var[ycnt], cex=0.7)
        }
    }

这是一个基于字母的直方图。考虑按数字调整第一个字母的大小，但决定反对，因为它已经编码在垂直分量中。

# "Load" data
nms <- c("Ad","am","ar","as","bc","bd","bp","br","BR","bs","by","c","C","cc","cd","ch","ci","CJ","ck","Cl","cm","cn","cq","cs","Cs","cv","d","D","dc","dd","de","df","dg","dn","do","ds","dt","e","E","el","ES","F","FF","fn","gc","gl","go","H","Hi","hm","I","ic","id","ID","if","IJ","Im","In","ip","is","J","lh","ll","lm","lo","Lo","ls","lu","m","MH","mn","ms","N","nc","nd","nn","ns","on","Op","P","pa","pf","pi","Pi","pm","pp","ps","pt","q","qf","qq","qr","qt","r","Re","rf","rk","rl","rm","rt","s","sc","sd","SJ","sn","sp","ss","t","T","te","tr","ts","tt","tz","ug","UG","UN","V","VA","Vd","vi","Vo","w","W","y") #all names
two_in_base <- c("ar", "as", "by", "cm", "de", "df", "dt", "el", "gc", "gl", "if", "Im", "is", "lh", "lm", "ls", "pf", "pi", "pt", "qf", "qr", "qt", "Re", "rf", "rm", "rt", "sd", "ts", "vi") # 2-letter names in base R
vowels <- c("a","e","i","o","u")
vowels <- c( vowels, toupper(vowels) )

# Constants
yoffset.singles <- 3

# Define a function to give us consistent X coordinates
returnX <- function(vec) {
  sapply(vec, function(x) seq(length(all.letters))[ x == all.letters ] )
}

# Make df of 2-letter names
combi <- nms[ sapply( nms, function(x) nchar(x)==2 ) ]
combidf <- data.frame( first = substr(combi,1,1), second=substr(combi,2,2) )
library(plyr)
combidf <- arrange(combidf,first,second)

# Add vowels
combidf$first.vwl <- (combidf$first %in% vowels)
combidf$second.vwl <- (combidf$second %in% vowels)

# Flag items only in base R
combidf$in_base <- paste(combidf$first,combidf$second,sep="") %in% two_in_base

# Create a data.frame to hold our plotting information for the first letters
combilist <- dlply(combidf,.(first),function(x) x$second)
combi.first <- data.frame( first = names(combilist), n = sapply(combilist,length) ,stringsAsFactors=FALSE )
combi.first$y <- 0
all.letters <-  c(letters,LETTERS) # arrange(combi.first,desc(n))$first to go in order of prevalence (which may break the one-letter name display)
combi.first$x <- returnX( combi.first$first )

# Create a data.frame to hold plotting information for the second letters
combidf$x <- returnX( combidf$first )
combidf$y <- unlist( by( combidf$second, combidf$first, seq_along ) )

# Make df of 1-letter names
sngldf <- data.frame( sngl = nms[ sapply( nms, function(x) nchar(x)==1 ) ] )
singles.y <- max(combidf$y) + yoffset.singles
sngldf$y <- singles.y
sngldf$x <- returnX( sngldf$sngl )

# Plot
library(ggplot2)
ggplot(data=combidf, aes(x=x,y=y) ) +
  geom_text(aes( label=second, size=3, colour=combidf$in_base ), position=position_jitter(w=0,h=.25)) +
  geom_text( data=combi.first, aes( label=first, x=x, y=y, size=4 ) ) +
  geom_text( data=sngldf, aes( label=sngl, x=x, y=y, size=4 ) ) +
  scale_size(name="Order (2-letter names)",limits=c(1,4),breaks=c(1,2),labels=c("Second","First")) +
  scale_x_continuous("",breaks=c(13,39),labels=c("lower","UPPER")) +
  scale_y_continuous("",breaks=c(0,5,singles.y),labels=c("First letter of two-letter names","Second letter of two-letter names","One-letter names") ) +
  coord_equal(1.5) +
  labs( colour="In base R" )

100 的元素周期表，亚历克斯。不过，我没有它的代码。:(

有人可能认为 CRAN 中可能已经存在“元素周期表”包。此类数据的配色方案和布局的想法可能很有趣且有用。

这些可以按包着色并按频率垂直排序，例如在 CRAN 上的代码示例中或它们出现在本地代码库中。