That is the default. But, we want to user to be able to control the representation for numerical analysis reasons, too. So, we're allowing both.<br><br><div class="gmail_quote">On Thu, Aug 13, 2009 at 9:50 PM, Eli Barzilay <span dir="ltr"><<a href="mailto:eli@barzilay.org">eli@barzilay.org</a>></span> wrote:<br> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">On Aug 13, Doug Williams wrote:<br> </div><div class="im">> >* However, if you're doing a lot of work *inside* Scheme, then<br> > > things can become very inefficient. For example, say that you<br> > > want to loop over a floating point array and multiply all of the<br> > > values by a given factor. What will happen in this case is: each<br> > > time you read a value, you allocate a Scheme object for the fp<br> > > number, multiplying that allocates a new one, then saving it<br> > > copies the result back to the array, leaving the two allocated<br> > > values to be GCed. (There are some JIT-level optimizations for<br> > > fp numbers, I don't know if it can save one of these allocations<br> > > in this case.)<br> ><br> > My plan would be to do the work inside of Scheme - at least for<br> > now. It would be interesting to see if there are some JIT<br> > optimizations planned for the future that could help.<br> <br> </div>In this case going with a Scheme vector will be faster.<br> <div><div></div><div class="h5"><br> --<br> ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:<br> <a href="http://barzilay.org/" target="_blank">http://barzilay.org/</a> Maze is Life!<br> </div></div></blockquote></div><br>