code: @Override
      public void invert(DMatrixRMaj A_inv) {
          blockB.reshape(A_inv.numRows,A_inv.numCols,false);
  
          alg.invert(blockB);
  
          MatrixOps_DDRB.convert(blockB,A_inv);
      }
docs: Creates a block matrix the same size as A_inv, inverts the matrix and copies the results back
  onto A_inv.
  
  @param A_inv Where the inverted matrix saved. Modified.