On Dec 10, 2007 4:07 PM, Neal Becker &lt;<a href="mailto:ndbecker2@gmail.com">ndbecker2@gmail.com</a>&gt; wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
So, we actually _want_ iterators of a zero vector to skip over the zeros? &nbsp;I<br>guess I really don&#39;t understand this.<br><div><div></div><div class="Wj3C7c"></div></div></blockquote><div><br>The thing is that a zero vector doesn&#39;t actually store the zeros. So, there&#39;s nothing to iterate over. Same thing with sparse vectors and matrices. Skipping (unstored) zeros is a good thing during calculations (
i.e. a dot product) to speed things up, I guess.<br><br>Cheers!<br>SG<br></div></div><br>