title: wordcloud package: get "Error in strwidth(...) : invalid 'cex' value"
body: <p>I am using the tm and wordcloud packages in R 2.15.1.
  I am trying to make a word cloud from a DTM. Here is the code: </p>
  
  <pre><code>library(wordcloud)
  thedtmsparse = inspect(sparse)
  trymatrix = t(thedtmsparse)
  colnames(trymatrix) = c()
  comparison.cloud(trymatrix, max.words=15, random.order=FALSE)
  </code></pre>
  
  <p>I get the following error from the last command:</p>
  
  <pre><code>Error in strwidth(words[i], cex = size[i], ...) : invalid 'cex' value
  </code></pre>
  
  <p>I have used the same code on another DTM where it worked fine and I got the word cloud.
  Can somebody tell me a fix for the error?</p>
  
  <p>Ravi</p>