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    <p>Here is another solution, using <code>strsplit</code>:</p> <pre><code># The data df.1 = read.table(header=TRUE, text=" color identifier blue 'A1, B2, C3, C4' yellow 'B2, C4, C6' green 'A3'", stringsAsFactors = FALSE) df.2 = read.table(header=FALSE, text=" A1 Mercedes A3 BMW B2 Porsche C3 Toyota C4 Hundai C5 Volkswagen C6 Peugeot", stringsAsFactors=FALSE) names(df.2) = c("identifier", "car") df.1$identifier = strsplit(df.1$identifier, split=", ") df.1$identifier1 = lapply(1:nrow(df.1), function(x) df.2[which(df.2$identifier %in% df.1$identifier[[x]]), 2]) df.1 # color identifier identifier1 # 1 blue A1, B2, C3, C4 Mercedes, Porsche, Toyota, Hundai # 2 yellow B2, C4, C6 Porsche, Hundai, Peugeot # 3 green A3 BMW </code></pre> <p>Note that <code>identifier</code> and <code>identifier1</code> are now <em>lists</em> in your <code>data.frame</code>. I personally find this easier to work with later on.</p> <pre><code>str(df.1) # 'data.frame': 3 obs. of 3 variables: # $ color : chr "blue" "yellow" "green" # $ identifier :List of 3 # ..$ : chr "A1" "B2" "C3" "C4" # ..$ : chr "B2" "C4" "C6" # ..$ : chr "A3" # $ identifier1:List of 3 # ..$ : chr "Mercedes" "Porsche" "Toyota" "Hundai" # ..$ : chr "Porsche" "Hundai" "Peugeot" # ..$ : chr "BMW" </code></pre> <p>You may need to modify the <code>strsplit</code> if there is any whitespace left over, but it works with this sample data. Also, for <code>strsplit</code> to work, the data need to be in mode <code>as.character</code> (hence my use of <code>stringsAsFactors</code> when reading in the data).</p> <h1>Update: write.table()</h1> <p>I <em>do</em> prefer to keep the data in lists in case I wanted to do further analysis. However, if the data are complete or just for output purposes, you might want to do something like this:</p> <pre><code>df.3 = df.1 df.3$identifier = sapply(df.3$identifier, paste0, collapse=", ") df.3$identifier1 = sapply(df.3$identifier1, paste0, collapse=", ") </code></pre> <p>This will allow you to use <code>write.table</code> since <code>identifier</code> and <code>identifier1</code> are now of mode <code>character</code> instead of <code>list</code>.</p>
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    1. COThank you, mrdwab, this solution worked perfectly for me.
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    2. COBut is it really easier to work on with lists within the data.frame? E.g. I get error messages if I try to write a table.
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    3. CO@R.newbie, see my update.
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