<div dir="ltr"><div><div> y = ln(p)<br></div> dy/dp = 1/p<br><br></div>so .... maybe<br><br><b>p*dTheta/d(lnp),</b><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 17, 2016 at 8:32 AM, Xi Chang <span dir="ltr"><<a href="mailto:xi.chang01@gmail.com" target="_blank">xi.chang01@gmail.com</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><div><div><div><div><div>Hallo,<br><br></div>I tried to calculate dTheta/dp using center finite difference with the folllowing methods:<br><br></div>1. direct calculation of <b>dTheta/dp</b> using center finite difference<br><br></div>2. using this approximation <b> (1/p)*dTheta/d(lnp), </b>also using center finite difference.<br><br></div>BUT surprisingly this gives me different results, for instance the method 1 give ma value 100 K/Pa but the method 2 gives me much smaller values 0.0xxx K/Pa.<br><br></div>Thanks for suggestion.<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888">Chang<br></font></span></div>
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