docs: public static SimpleMatrix loadBinary( String fileName )
              throws IOException {
          DMatrix mat = MatrixIO.loadBin(fileName);
  
          // see if its a DMatrixRMaj
          if( mat instanceof DMatrixRMaj) {
              return SimpleMatrix.wrap((DMatrixRMaj)mat);
          } else {
              // if not convert it into one and wrap it
              return SimpleMatrix.wrap( new DMatrixRMaj(mat));
          }
      }