title: convert simple triplet matrix(slam) to sparse matrix(Matrix) in R
body: <p>Is there a built-in function in either slam package or Matrix package to convert a sparse matrix in simple triplet matrix form (from slam package) to a sparse matrix in dgTMatrix/dgCMatrix form (from Matrix package) ? </p>
  
  <p>And is there a built-in way to access non-zero entries from simple triplet matrix ?</p>
  
  <p>I'm working in R</p>