minor optimisation

2024-02-06 11:35:20 +10:00
parent 9680a3b1d4
commit eef2a2706c
1 changed files with 2 additions and 0 deletions
@@ -64,6 +64,8 @@ op_shift::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword len, const u
  arma_debug_check_bounds( ((dim == 0) && (len >= X.n_rows)), "shift(): shift amount out of bounds" );
  arma_debug_check_bounds( ((dim == 1) && (len >= X.n_cols)), "shift(): shift amount out of bounds" );
  
+  if(len == 0)  { out = X; return; }
+  
  out.copy_size(X);
  
  const uword X_n_rows = X.n_rows;