octave: liboctave/dim-vector.h comparison

[project @ 2004-07-23 19:01:22 by jwe]

comparison

equal deleted inserted replaced

-:1c0442da75fd
+:c638c144d4da
 	else
 	  new_dims.resize(k);
 }
 return new_dims;
+}
+bool concat (const dim_vector& dvb, int dim = 0)
+{
+if (all_zero ())
+{
+	*this = dvb;
+	return true;
+}
+if (dvb.all_zero ())
+return true;
+int na = length ();
+int nb = dvb.length ();
+// Find the max and min value of na and nb
+int n_max = na > nb ? na : nb;
+int n_min = na < nb ? na : nb;
+// The elements of the dimension vectors can only differ
+// if the dim variable differs from the actual dimension
+// they differ.
+for (int i = 0; i < n_min; i++)
+{
+	if (elem(i) != dvb(i) && dim != i)
+	    return false;
+}
+// Ditto.
+for (int i = n_min; i < n_max; i++)
+{
+	if (na > n_min)
+	  {
+	    if (elem(i) != 1 && dim != i)
+	      return false;
+	  }
+	else
+	  {
+	    if (dvb(i) != 1 && dim != i)
+	      return false;
+	  }
+}
+// If we want to add the dimension vectors at a dimension
+// larger than both, then we need to set n_max to this number
+// so that we resize *this to the right dimension.
+n_max = n_max > (dim + 1) ? n_max : (dim + 1);
+// Resize *this to the appropriate dimensions.
+if (n_max > na)
+{
+	dim_vector_rep *old_rep = rep;
+	rep = new dim_vector_rep (n_max, old_rep, 1);
+	if (--old_rep->count <= 0)
+	  delete old_rep;
+}
+// Larger or equal since dim has been decremented by one.
+if (dim >= nb)
+elem (dim) = elem (dim)++;
+else
+elem (dim) += dvb(dim);
+return true;
 }
 };
 static inline bool
 operator == (const dim_vector& a, const dim_vector& b)

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