title: Generating an empty matrix of known dimensions
body: <p>I want to generate a matrix of known dimension in Octave. The problem is that I do not want to initialize the matrix with zeros. The matrix will only contain 0 or 1 but the elements (cells) which do not get allocated any value, must remain blank. Plan to use such a matrix in 'Collaborative Filtering' algo. </p>
  
  <p>I am new to both Ocatve and 'Collaborative Filtering' algos. Have tried to look for the solution on the net but to no avail. Keywords empty matrix on net refers to arrays with zero dimensions or char matrix with " " as values.</p>