R An if else statement inside a for loop -

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i have data table made of 3 columns assigned variable g. 

g #      v1   v2 v3 # [1,]  1  yes  3 # [2,]  4   no  6 # [3,]  7   no  9 # ...

i'm trying create list, m, checking see if values in g[,2] "yes" or "no", , pasting string m. 

m <- for(i in 1:nrow(g)){   if(g[i,2]=='no'){     paste0("abc", g[i,1], "def", g[i,2], "ghi", g[i,3],"\n")   } else if(g[i,2]=='yes'){     paste0("ghi", g[i,1], "def", g[i,2], "abc", g[i,3],"\n")   } else {null} }  m # null

however when try return m, returns null. want m this:

m # abc1defyesghi3 # ghi2defnoabc9

can point out doing wrong here? thank much!

a for loop doesn't return in r. typically want update variable continue using after for loop. example: 

m <- "intialize" # initialize, better `list()` for(i in 1:nrow(g)){   if(g[i,2]=='no'){     # paste position of vector m     m[i] <- paste0("abc", g[i,1], "def", g[i,2], "ghi", g[i,3],"\n")    } else if(g[i,2]=='yes'){     # paste position of vector m     m[i] <- paste0("abc", g[i,1], "def", g[i,2], "ghi", g[i,3],"\n")   } else {   null   } } m > ...

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