docs: public static void print(PrintStream out , DMatrix mat , String format ) {
  
          if( format.toLowerCase().equals("matlab")) {
              printMatlab(out, mat);
          } else if( format.toLowerCase().equals("java")) {
              printJava(out,mat,format);
          } else {
              printTypeSize(out, mat);
  
              format += " ";
  
              for (int row = 0; row < mat.getNumRows(); row++) {
                  for (int col = 0; col < mat.getNumCols(); col++) {
                      out.printf(format, mat.get(row, col));
                  }
                  out.println();
              }
          }
      }