<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Hi Andrew,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">different optimizers have different behavior (e.g. small steps vs big steps), but even the programming interface is not uniform. Some functions are called differently e.g. maximumSteps vs iterationCount etc. You should look at the respective examples for each optimizer which you plan to use to see how iteration tracking is set up.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Regards,</div><div class="gmail_default"><font face="verdana, sans-serif">Dženan Zukić, PhD, Senior R&D Engineer, Kitware (Carrboro, N.C.)</font></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 28, 2017 at 4:10 PM, Andrew Harris <span dir="ltr"><<a href="mailto:aharr8@uwo.ca" target="_blank">aharr8@uwo.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<div>I'm attempting to track the movement of images under registration using various optimizers. I have a CommandIterationUpdate observer set up to write the optimizer positions to file, and when I use a Gradient Descent or Powell optimizer I get a vector for the translation applied using optimizer->GetCurrentPosition(<wbr>), however if I use the LBFGSB optimizer I get zero vectors all the way down (it returns the correct result though). Is the functionality of GetCurrentPosition() different in the LBFGSB optimizer than the others?<br clear="all"><div><div class="m_-8479218440453239486gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><p>--</p><p>AH<br></p><p><br></p><p>------------------------------<wbr>------------------------------<wbr>------------------------------<wbr>-----</p><p><i>This email and any attachments thereto may contain private, confidential, and privileged materials for the sole use of the intended recipient. Any reviewing, copying, or distribution of this email (or any attachments thereto) by other than the intended recipient is strictly prohibited. If you are not the intended recipient, please contact the sender immediately and permanently destroy this email and any attachments thereto.</i></p></div></div></div></div></div></div></div></div></div>
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