R help - Oct 2013 - String substitution

Hi,
Try:
dat$y<- as.character(dat$y)
dat1<- dat
dat2<- dat
library(stringr)
?dat$y[NET]<- substr(word(dat$y[NET],2),1,1)
?dat$y
#[1] "n"???? "n"???? "house" "n"????
"tree"

#or
for(i in 1:length(NET)){dat1$y[NET[i]]<- "n"}
?dat1$y
#[1] "n"???? "n"???? "house" "n"????
"tree"
#or
dat2$y[NET]<- gsub(".*(n).*","\\1",dat2$y[NET])
?dat2$y
#[1] "n"???? "n"???? "house" "n"????
"tree"


A.K.


Hello, 

I am trying to replace strings containing a certain word, I 
first identified the word (in this example "net") with grep, and then
I
need to replace those string with "n". It should be very simple but I 
don't seem to find the solution. 
? 
Example: 

x<-c(5:9) 
y<- c("with net", "with nets", "house",
"no nets", "tree")
dat<-as.data.frame(cbind(x, y) ) 
NET<-grep("net", dat$y) 

# I want y to become ("n", "n", "house",
"n", "tree") #

# I have tried several ways including the following but without success # 

for (i in 1: length(NET)) { 
dat$y[NET[i]]<- "n" } 


Thank you for your help!

Wonderful!

Thank you Arun!

Irene
 
Irene Ruberto




________________________________
 Da: arun kirshna [via R] <ml-node+s789695n4677558h52@n4.nabble.com>

Inviato: Giovedì 3 Ottobre 2013 22:51
Oggetto: Re: String substitution



Hi, 
Try: 
dat$y<- as.character(dat$y) 
dat1<- dat 
dat2<- dat 
library(stringr) 
 dat$y[NET]<- substr(word(dat$y[NET],2),1,1) 
 dat$y 
#[1] "n"     "n"     "house" "n"    
"tree"

#or 
for(i in 1:length(NET)){dat1$y[NET[i]]<- "n"} 
 dat1$y 
#[1] "n"     "n"     "house" "n"    
"tree"
#or 
dat2$y[NET]<- gsub(".*(n).*","\\1",dat2$y[NET]) 
 dat2$y 
#[1] "n"     "n"     "house" "n"    
"tree"


A.K. 


Hello, 

I am trying to replace strings containing a certain word, I 
first identified the word (in this example "net") with grep, and then
I
need to replace those string with "n". It should be very simple but I 
don't seem to find the solution. 
  
Example: 

x<-c(5:9) 
y<- c("with net", "with nets", "house",
"no nets", "tree")
dat<-as.data.frame(cbind(x, y) ) 
NET<-grep("net", dat$y) 

# I want y to become ("n", "n", "house",
"n", "tree") #

# I have tried several ways including the following but without success # 

for (i in 1: length(NET)) { 
dat$y[NET[i]]<- "n" } 


Thank you for your help! 

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