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POCSV of Distances to Dist Object R
 

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  1. POCSV of Distances to Dist Object R
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/11343637/convert-a-dataframe-to-an-object-of-class-dist-without-actually-calculating-di">Convert a dataframe to an object of class &ldquo;dist&rdquo; without actually calculating distances in R</a> </p> </blockquote> <p>I have a very large csv file (so a for loop takes too long in R) of similarities between keywords that when I read into a data.frame looks like:</p> <pre><code>&gt; df kwd1 kwd2 similarity a b 1 b a 1 c a 2 a c 2 </code></pre> <p>I would like to convert this to a dist object, like this:</p> <pre><code>&gt; dObject a b b 1 c 2 0 </code></pre> <p>I was unable to get this to work: <a href="https://stackoverflow.com/questions/11343637/convert-a-dataframe-to-an-object-of-class-dist-without-actually-calculating-di">Convert a dataframe to an object of class &quot;dist&quot; without actually calculating distances in R</a></p> <p>Another idea I had was to create a sparse matrix using Matrix(), but I am unsure how to populate the matrix efficiently because my csv is fairly large - maybe an apply function?</p> <p>Maybe reshape()?</p> <p>---- Update ---- This seems to work on the toy dataset above: <a href="https://stats.stackexchange.com/questions/6827/efficient-way-to-populate-matrix-in-r">https://stats.stackexchange.com/questions/6827/efficient-way-to-populate-matrix-in-r</a></p> <p>However, in this example, they use a matrix(), but I would like to use Matrix() that is sparse for memory reasons.</p> <p>--- Furthermore ---- There is a similar posting from before. However, I don't think that the advice from it works for this case in which their isn't a link between every element in the dataset - the csv doesn't contain the pairwise similarities between all keywords as in the previous post: <a href="https://stackoverflow.com/questions/11343637/convert-a-dataframe-to-an-object-of-class-dist-without-actually-calculating-di/12289896#12289896">Convert a dataframe to an object of class &quot;dist&quot; without actually calculating distances in R</a></p>
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    1. COWhat have you tried that it doesn't work? I think we should wait with the closing as duplicate until the OP has time to elaborate.
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      1. USRoman Luštrik
 

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