So, when I evaluate x at idx, you, that's your shuffled data, okay? &amp;amp;gt;&amp;amp;gt; I missed that line in here. &amp;amp;gt;&amp;amp;gt; So, when you first, when I first looked at the bootstrap library, and I'm looking at, you have to write this function to do this on thing, how was this, so, this is what's going on. 