[R] factor with numeric names

[agent dunham]

Dear all, 

According to the post I was trying: 

factorA = c(2,2,3,3,4,4,3,4,2,2) 
levels(factorA <- c("lv1","lv2","lv3") ) 

But this returns NULL and doesn't change factor names. 

Actually, my factor is included in a data.frame, so I also tried: 

levels(df$factorA)[levels(df$factorA)=="2"] <- "lv1"  Also
levels(df$factorA)[levels(df$factorA)==2] <- "lv1" 
levels(df$factorA)[levels(df$factorA)=="3"] <- "lv2" 
levels(df$factorA)[levels(df$factorA)=="4"] <- "lv3" 

then I type table(df$factorA) and it doesn't work either. 

After attach(df), I tried also this 

for(i in 1:10) 
   { if(factor(factorA)[i]==2) factorA[i]="lv2" else {; 
      if(factor(factorA)[i]==3) factorA[i]="lv3" else {; 
      factorA[i]= "lv4"}}}}


Any help would be appreciated. Thanks, user at host.com

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