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POHow can I order a dataframe by the second column in R?
 

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  1. POHow can I order a dataframe by the second column in R?
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/1296646/how-to-sort-a-dataframe-by-columns-in-r">How to sort a dataframe by column(s) in R</a> </p> </blockquote> <p>I was just wondering if some one could help me out, I have what I thought should be a easy problem to solve.</p> <p>I have the table below:</p> <pre><code>SampleID Cluster R0132F041p 1 R0132F127 1 R0132F064 1 R0132F068p 1 R0132F015 2 R0132F094 3 R0132F105 1 R0132F013 2 R0132F114 1 R0132F014 2 R0132F039p 3 R0132F137 1 R0132F059 1 R0132F138p 2 R0132F038p 2 </code></pre> <p>and I would like to sort/order it by <strong>Cluster</strong> to get the results as below:</p> <pre><code>SampleID Cluster R0132F041p 1 R0132F127 1 R0132F064 1 R0132F068p 1 R0132F105 1 R0132F114 1 R0132F137 1 R0132F059 1 R0132F015 2 R0132F013 2 R0132F014 2 R0132F138p 2 R0132F038p 2 R0132F094 3 R0132F039p 3 </code></pre> <p>I have tried the following R code: </p> <pre><code>data&lt;-read.table('Table.txt', header=TRUE,row.names=1,sep='\t') data &lt;- data.frame(data) data &lt;- data[order(data$Cluster),] write.table(data, file = 'OrderedTable.txt', append = TRUE,quote=FALSE, sep = '\t', na ='NA', dec = '.', row.names = TRUE, col.names = FALSE) </code></pre> <p>and get the following output:</p> <pre><code>1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 10 2 11 2 12 2 13 2 14 3 15 3 </code></pre> <p>Why have the <strong>SampleIDs</strong> been replaced by the numbers 1-15 and what do these numbers represent, I have read the <code>?order()</code> page however this seems to explain <strong>sort.list</strong> better than <strong>order()</strong> if any one could help me out on this I would be very grateful.</p>
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