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<p style="margin-top:0;margin-bottom:0">Dear Jian,</p>
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<p style="margin-top:0;margin-bottom:0">There are an infinite number of r values but only a finite number</p>
<p style="margin-top:0;margin-bottom:0">of ix values, so there is no one-to-one mapping of r to ix.</p>
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<p style="margin-top:0;margin-bottom:0">If you want the closest one, you could check against the positions of</p>
<p style="margin-top:0;margin-bottom:0">the Gauss-Lobatto-Legendre points, zgm1(ix,1), for ix=1,...,lx1.</p>
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<p style="margin-top:0;margin-bottom:0">Paul</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nek5000-users <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of nek5000-users@lists.mcs.anl.gov <nek5000-users@lists.mcs.anl.gov><br>
<b>Sent:</b> Tuesday, September 18, 2018 6:09 AM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] rst to ix iy iz</font>
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<div dir="ltr">Dear nek,
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<div>Do you know how to convert r, s, t in [-1,1] to ix, iy, iz in an element? </div>
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<div>Actually I didn't see too many documents about reference space coordinates. Can you please provide some links for that? Thanks </div>
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<div>Kind regards,</div>
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<div>Jian</div>
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