Hi Chris,<div><br></div><div>I can't think of much that could cause this problem, but the most obvious one is supplying an empty single-fibre mask at the estimate_response step. Another reason might have been if any of the single-fibre voxels has one or more zero DW intensities - but I've just looked at the code, and there are safeguards in place to handle negative or zero DW intensities, so I can't see that it could be that either. If none of this helps, maybe you can send me one of the offending data sets so I can have look?</div>
<div><br></div><div>Cheers,</div><div><br>Donald.</div><div><br><br><div class="gmail_quote">On 27 August 2012 11:57, Chris Adamson <span dir="ltr"><<a href="mailto:chris.adamson@mcri.edu.au" target="_blank">chris.adamson@mcri.edu.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Donald,<br>
<br>
I am getting NaN values in the response.txt file in rare cases. How can<br>
I diagnose the problem/fix it? What should I look for in the data that<br>
would cause a failure of the ellipse fitting?<br>
<br>
Chris.<br>
--<br>
Dr Christopher Adamson, PhD (Melb.), B Software Engineering (Hons.,<br>
Monash)<br>
Research Officer<br>
Developmental Imaging, Critical Care and Neurosciences<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><font color="#ff6600" size="1"><b>Dr Jacques-Donald Tournier<br></b></font><div><font color="#ff6600" size="1">Research Fellow</font></div><div><font size="1"><br>
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