R - How to replace two word with one word?

Question

Lets Take example

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

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. 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 ?

let suppose

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

let

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

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

i want output like this

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

Are you just trying to remove spaces from `word1`? How is `word2` related here? See here http://stackoverflow.com/questions/5992082/how-to-remove-all-whitespace-from-a-string — David Arenburg, Aug 12 '16 at 08:54
'but its not working for two words are there in the first column in w',what does this mean? The for loop and gsub results in my computer is:`[1] "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"` — chunjin, Aug 12 '16 at 13:16

score 0 · Answer 1 · answered Aug 12 '16 at 09:23

0

Method 1: for loop and gsub function

You can use gsub function to replace word1 with word2 row by row. 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.

Method 2: mapvalues function in plyr package

The following code substitutes the 1,2,3(vector b ) in vector x with vector a.

library(plyr)
x = 1:4
a=c("A","B","C")
b=1:3
mapvalues(x,b,a)
[1] "A" "B" "C" "4"

answered Aug 12 '16 at 09:23

chunjin

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1
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what if my Vector x here not a vector but data.frame then ? – Dikesh Faldu Aug 12 '16 at 09:54
you can use apply , use column vector to replace it. – chunjin Aug 12 '16 at 11:12

R - How to replace two word with one word?

1 Answers1

Method 1: for loop and gsub function

Method 2: mapvalues function in plyr package