[R] combine all data frame columns into a vector.

[arun]

Hi,


May be this help:
dat1<- structure(list(V1 = c("h", "f", "s", "n", "r", "x", "h", "t", 
"u", "g"), V2 = c("p", "j", "r", "r", "i", "x", "f", "b", "n", 
"d"), V3 = c("c", "o", "s", "d", "f", "r", "b", "p", "q", "b"
), V4 = c("i", "g", "j", "d", "y", "f", "s", "q", "s", "z"), 
    V5 = c("m", "j", "h", "f", "b", "b", "k", "j", "g", "i"), 
    V6 = c("m", "w", "m", "s", "o", "z", "l", "h", "e", "d"), 
    V7 = c("m", "g", "h", "d", "s", "i", "y", "z", "t", "m"), 
    V8 = c("d", "f", "a", "z", "q", "i", "o", "v", "a", "s"), 
    V9 = c("n", "d", "n", "f", "j", "j", "g", "w", "k", "v"), 
    V10 = c("i", "t", "y", "c", "m", "p", "q", "c", "k", "m")), .Names = c("V1", 
"V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9", "V10"), row.names = c(NA, 
-10L), class = "data.frame")

unique(unlist(dat1))
# [1] "h" "f" "s" "n" "r" "x" "t" "u" "g" "p" "j" "i" "b" "d" "c" "o" "q" "y" "z"
#[20] "m" "k" "w" "l" "e" "a" "v"

#or
unique(as.vector(as.matrix(dat1)))
# [1] "h" "f" "s" "n" "r" "x" "t" "u" "g" "p" "j" "i" "b" "d" "c" "o" "q" "y" "z"
#[20] "m" "k" "w" "l" "e" "a" "v"
A.K.


----- Original Message -----
From: "Khan, Sohail" <SKhan30 at nshs.edu>
To: 'greatest.possible.newbie' <daniel.hoop at gmx.net>; "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Monday, August 12, 2013 4:23 PM
Subject: [R] combine all data frame columns into a vector.

Dear All,

Could anyone suggest a quick way to combine all columns in a data frame into a vector?
For example, I have a data frame of 205 columns with character data types, many data values are repeated in all the columns.  Actually, I would like to retrieve all the unique values from this data set.  My strategy is to put all column value into a vector and then select unique from that vector.

I would appreciate a more efficient method.
Thanks.
-Sohail


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