code: public static void symmLowerToFull( DMatrixSparseCSC A , DMatrixSparseCSC B , @Nullable IGrowArray gw )
      {
          ImplCommonOps_DSCC.symmLowerToFull(A, B, gw);
      }
docs: Given a symmetric matrix, which is represented by a lower triangular matrix, convert it back into
  a full symmetric matrix
  
  @param A (Input) Lower triangular matrix
  @param B (Output) Symmetric matrix.
  @param gw (Optional) Workspace. Can be null.