title: Constructing a term-term co-occurrence matrix in R?
body: <p>I have a big corpus. I want to create a term-term co-occrrence matrix from this corpus. But I want to use sliding window concept (a fixed size window). I will use this matrix in R environment(as textmatrix format) so the matrix must be in R format or convertable to R format.</p>
  
  <p>Do you know a good tool for this purpose? Writing code of myself seems a bit  troublesome to me.</p>