Merge or combine by rownames

Question

In the example below I have two datasets (Z and A). I want to merge or combine these sets by the ILMN numbers. If there is no match, fill in NA.

z <- matrix(c(0,0,1,1,0,0,1,1,0,0,0,0,1,0,1,1,0,1,1,1,1,0,0,0,"RND1","WDR", "PLAC8","TYBSA","GRA","TAF"), nrow=6,     dimnames=list(c("ILMN_1651838","ILMN_1652371","ILMN_1652464","ILMN_1652952","ILMN_1653026","ILMN_1653103"),c("A","B","C","D","symbol")))  t<-matrix(c("GO:0002009", 8, 342, 1, 0.07, 0.679, 0, 0, 1, 0,          "GO:0030334", 6, 343, 1, 0.07, 0.065, 0, 0, 1, 0,         "GO:0015674", 7, 350, 1, 0.07, 0.065, 1, 0, 0, 0), nrow=10, dimnames= list(c("GO.ID","LEVEL","Annotated","Significant","Expected","resultFisher","ILMN_1652464","ILMN_1651838","ILMN_1711311","ILMN_1653026"))) 

The result will be like this:

             [,1]         [,2]         [,3]         [,4] GO.ID        "GO:0002009" "GO:0030334" "GO:0015674"  NA LEVEL        "8"          "6"          "7"           NA Annotated    "342"        "343"        "350"         NA Significant  "1"          "1"          "1"           NA Expected     "0.07"       "0.07"       "0.07"        NA resultFisher "0.679"      "0.065"      "0.065"       NA ILMN_1652464 "0"          "0"          "1"           PLAC8 ILMN_1651838 "0"          "0"          "0"           RND1 ILMN_1711311 "1"          "1"          "0"           NA ILMN_1653026 "0"          "0"          "0"           GRA 

Answer 1

Using merge and renaming your t vector as tt (see the PS of Andrie) :

merge(tt,z,by="row.names",all.x=TRUE)[,-(5:8)] 

Now if you would work with dataframes instead of matrices, this would even become a whole lot easier :

z <- as.data.frame(z) tt <- as.data.frame(tt) merge(tt,z["symbol"],by="row.names",all.x=TRUE)