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<i><a name="637151"><i>Hi all,<br>
<br>
</i></a></i>I've learned that, for all of the PW based DFT
codes, such as, VASP/PWscf/Abinit/CASTEP, the <br>
FFT grid is generated based on the cutoff energy. So if we have
tested the convergence total energy vs cutoff energy, then the <br>
FFT grid used for our calcultions should also be OK based on the
selected cutoff energy. In other words, it is unnecessary to do a
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<p style="margin: 0px; text-indent: 0px;">Independent FFT grid
convergence test. Am I right?<br>
<br>
</p>
Regards.<br>
-- <br>
<pre class="moz-signature" cols="72">Hongsheng Zhao <a class="moz-txt-link-rfc2396E" href="mailto:zhaohscas@yahoo.com.cn"><zhaohscas@yahoo.com.cn></a>
School of Physics and Electrical Information Science,
Ningxia University, Yinchuan 750021, China</pre>
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