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" <[email protected]>
To: 'greatest.possible.newbie' <[email protected]>; "[email protected]"
<[email protected]>
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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