--- a/inst/@dataframe/private/df_matassign.m
+++ b/inst/@dataframe/private/df_matassign.m
@@ -311,7 +311,7 @@
     indj = 1;
     for indi = (1:ncol)
       if (indc(indi) > df._cnt(2))
-	%# perform dynamic resizing one-by-one, to get type right
+        %# perform dynamic resizing one-by-one, to get type right
         if (isempty (ctype) || length (ctype) < indc(indi))
           df = df_pad(df, 2, indc(indi)-df._cnt(2), class(RHS{1, indj}));
         else
@@ -348,12 +348,12 @@
             endswitch
           endif
         catch
-	  fprintf (2, "Something went wrong while converting colum %d\n", indj);
-	  fprintf (2, "Error was: %s\n", lasterr ());
-	  dummy =  unique(cellfun(@class, RHS(:, indj), ...
+          fprintf (2, "Something went wrong while converting colum %d\n", indj);
+          fprintf (2, "Error was: %s\n", lasterr ());
+          dummy =  unique(cellfun(@class, RHS(:, indj), ...
                                   'UniformOutput', false));
           if (any (strmatch ("char", dummy, "exact")))
-	    fprintf (2, "Downclassing to char\n");
+            fprintf (2, "Downclassing to char\n");
             %# replace the actual column, of type numeric, by a char 
             df._type{indc(indi)} = 'char';
             dummy = RHS(:, indj);
@@ -470,7 +470,7 @@
           %# third dim just in case
           if (isempty (S.subs{1})) S.subs{1} = ':'; endif 
           S.subs(2) = [];
-	  if (length (S.subs) < 2) 
+          if (length (S.subs) < 2) 
             S.subs{2} = 1; 
           endif 
           if (ncol > 1 && length (RHS) > 1)
@@ -482,17 +482,17 @@
         endif
         Sorig = S; 
         for indi = (1:ncol)
-	  try
-	    lasterr('');
+          try
+            lasterr('');
             dummy= 'df_cow';
-	    [df, S] = df_cow(df, S, indc(indi));
+            [df, S] = df_cow(df, S, indc(indi));
             dummy = 'fillfunc';
-	    df._data{indc(indi)} = fillfunc (df._data{indc(indi)}, S, indi);
+            df._data{indc(indi)} = fillfunc (df._data{indc(indi)}, S, indi);
             S = Sorig;
           catch
-	    disp (lasterr  ())
+            disp (lasterr  ())
             disp ('line 491 '); keyboard
-	  end_try_catch
+          end_try_catch
           # catch
           #   if ndims(df._data{indc(indi)}) > 2,
           #     %# upstream forgot to give the third dim