Hi list Can someone help me debug the following please: Having downloaded and installed the bioconductor packages and Rgraphviz, I am attempting to plot a network graph showing the relation among chosen words in the corpus of text data. I first did this: > plot(dtm, terms=findFreqTerms(dtm, lowfreq=100) [1:30], corThreshold=0.75) and received the error message: Error in `[.simple_triplet_matrix`(m, , terms) : NA indices not allowed. My next step was to remove any NA indices (although to be honest, this is more of a stab in the dark because there shouldn't be any NA values in the corpus): > docsNA <- (docs[!is.na(docs)]) Then redid the DTM with the NA values removed > dtmNA <- DocumentTermMatrix(docsNA) Then re-ran Rgraphviv with the new set > plot(dtmNA, terms=findFreqTerms(dtmNA, lowfreq=100) [1:10], corThreshold=0.5) But, still get an error: Error in `[.simple_triplet_matrix`(m, , terms) : NA indices not allowed. I have not been successful in finding out why this error persists nor what to do about it. Anyone have any ideas to progress past this issue? Thanks Sun