[英]R - How to replace two word with one word?
Lets Take example 让我们举个例子
I have one data frame called wf which has many rows and only 2 column 1st column has two word which will be relaced by 2nd column one word 我有一个称为wf的数据帧,它有很多行,只有2列,第1列有两个字,将被第2列一个字取代
wf
word1 word2
dikesh faldu dikeshfaldu
any thing anything
xyz asv xyzasv
....
like this there are many rows suppose n..I have this variable already so nothing to do with wf okay. 像这样,假设有很多行n ..我已经有了这个变量,所以与wf无关。 and i have one
Corpus
which has 2 document many text data so i have to find word1
and replace with word2
from wf
how can i do this ? 而且我有一个
Corpus
,其中有2个文档包含许多文本数据,因此我必须从wf
找到word1
并替换为word2
,我该怎么做?
let suppose 假设
w <- read.csv("xyz.csv")
w <- as.vector(w)
corpus <- Corpus(vectorSource(w))
then i want to find word1
in corpus
and replace with word2
然后我想在
corpus
找到word1
并替换为word2
let 让
w <- "hello, dikesh faldu i want to replace word1 with word2 in this text data how can i do this xyz asv . where word1 is occured in this document i want to replace with word2"
i can use this 我可以用这个
for (i in 1:nrow(wf)){
w <- gsub(wf[i,1],wf[i,2],w)
}
but its not working for two words are there in the first column in wf 但是在wf的第一列中没有两个词
i want output like this 我想要这样的输出
hello, dikeshfaldu i want to replace word1 with word2 in this text data how can i do this xyzasv . where word1 is occured in this document i want to replace with word2
You can use gsub function to replace word1 with word2 row by row. 您可以使用gsub函数逐行将word1替换为word2。 You just remember and understanding the structure of for loop in R and gsub function and the question can be solved ,though not so effecient but effectively.
您只要记住并了解R和gsub函数中for循环的结构,就可以解决问题,尽管效率不高,但有效。
The following code substitutes the 1,2,3(vector b
) in vector x
with vector a
. 下面的代码替换的1,2,3-(向量
b
)在矢量x
与矢量a
。
library(plyr)
x = 1:4
a=c("A","B","C")
b=1:3
mapvalues(x,b,a)
[1] "A" "B" "C" "4"
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