<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Hi Nick, <br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Make sure you start with the sum of the phase fractions set to 1 and copy flags to all histograms.<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Wrt exception you are getting, you want to turn off that cell/Dij parameter you refine.<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I am not sure which one is it, Check "Calculated/View LS params" menu. Some of the parameters have help button next to them.<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Cheers,<br></div><div style="font-family:arial,helvetica,sans-serif;font-size:small" class="gmail_default">Sergey</div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 14, 2017 at 3:25 PM, Nick Weadock <span dir="ltr"><<a href="mailto:nweadock@caltech.edu" target="_blank">nweadock@caltech.edu</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"><div>Hi,</div><div><br></div><div>I am having some issues with a sequential refinement in GSAS. I have been following along with the tutorial here: <a href="https://subversion.xray.aps.anl.gov/pyGSAS/Tutorials/SeqRefine/SequentialTutorial.htm" target="_blank">https://subversion.xray.<wbr>aps.anl.gov/pyGSAS/Tutorials/<wbr>SeqRefine/SequentialTutorial.<wbr>htm</a> to limited success.</div><div><br></div><div>Previously, I had trouble getting the phase fractions to sum to 1. I would put the "wildcard" constraint in as stated in the tutorial, but the phase fractions still would not sum to 1 after the refinement. I re-did the tutorial and got it to work, however. </div><div><br></div><div>I am trying the tutorial again, but have been running into the following exception: 'invalid metric tensor \n cell/Dij refinement not advised' I did not run into this problem previously.</div><div><br></div><div>Has anyone had experience with similar issues in sequential refinement? I am trying to perform sequential refinement of my own data, but had the same issues with the phase fractions. A colleague performed a sequential refinement on the same data but the phase fractions worked out fine for them.</div><div><br></div><div>I am using the most up to date version of GSAS-II. Any help would be greatly appreciated,</div><span class="HOEnZb"><font color="#888888"><div>-- <br><div class="m_-792366067645569876gmail_signature"><div dir="ltr"><div dir="ltr">Nick Weadock<div>PhD Candidate, Materials Science</div><div>California Institute of Technology</div><div>1200 E California Blvd, Pasadena, CA 91125</div><div>MC 138-78</div><div>x2520</div></div></div></div></div></font></span></div>
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