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来源:http://blog.chinaunix.net/uid-25135004-id-4311592.html
wordcloud函数--用于绘制词云图
用法:
wordcloud(words,freq,scale=c(4,.5),min.freq=3,max.words=Inf,random.order=TRUE, random.color=FALSE, rot.per=.1,
colors="black",ordered.colors=FALSE,use.r.layout=FALSE,fixed.asp=TRUE, ...)
参数
1)words --- 关键词列表
the words
2)freq---关键词对应的词频列表
their frequencies
3)scale---显示字体大小的范围,例如c(3,0.3),最大字体是3,最小字体是0.3
A vector of length 2 indicating the range of the size of the words
4)min.freq---最小词频,低于最小词频的词不会被显示
words with frequency below min.freq will not be plotted
5)max.words---显示的最大词数量。
Maximum number of words to be plotted. least frequent terms dropped
6)random.order---词在图上的排列顺序。T:词随机排列;F:词按频数从图中心位置往外降序排列,即频数大的词出现在中心位置。
plot words in random order. If false, they will be plotted in decreasing frequency
7)random.color---控制词的字体颜色。T:字体颜色随机分配;F:根据频数分配字体颜色。
choose colors randomly from the colors. If false, the color is chosen based on the frequency
8)rot.per---控制词摆放角度。T:旋转90度;F:水平摆放。
proportion words with 90 degree rotation
9)colors---字体颜色列表
color words from least to most frequent
10)ordered.colors---控制字体颜色使用顺序。T:按照指定的顺序给出每个关键词字体颜色,(似乎是要求颜色列表中每个颜色一一对应关键词列表);F:任意给出字体颜色。
if true, then colors are assigned to words in order
11)use.r.layout
if false, then c++ code is used for collision detection, otherwise R is used
12) fixed.asp
if TRUE, the aspect ratio is fixed. Variable aspect ratio only supported if rot.per==0
13) ...
Additional parameters to be passed to text (and strheight,strwidth).
Details
If freq is missing, then words can either be a character vector, or Corpus. If it is a vector and freq is
missing, standard stop words will be removed prior to plotting.
安装:
install.packages(‘wordcloud‘)
例子:
wordcloud(c(letters, LETTERS, 0:9), seq(1, 1000, len = 62))
具体使用例子:
1、直接显示图像的例子
点击(此处)折叠或打开
2、把图像保存为png
点击(此处)折叠或打开
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原文地址:http://www.cnblogs.com/fkissx/p/5540118.html