Hi Luis,<br>
<br>
Thanks a lot for that, I had a look at the class and it does seem do
what I'd like it to (and then some), so I might modify it to just do
the evaluating & calculating of derivatives (I need the bspline
object, but don't need it to approximate any data). After perusal of
the code, I think my problem is to do with my understanding of
B-splines. I thought I understood them, but I've become more and more
confused as to exactly how many knots/control points are needed and
where they should be placed. I'm going to do a bit more reading and
then come back this question later.<br>
<br>
thanks for all the help,<br>
Amy<br>
<br><div class="gmail_quote">On Mon, Jan 4, 2010 at 6:26 AM, Luis Ibanez <span dir="ltr"><<a href="mailto:luis.ibanez@kitware.com" target="_blank">luis.ibanez@kitware.com</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>Hi Amy,<br>
<br>
There are several forms of BSplines in ITK.<br>
<br>