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<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Apr 13, 2015 at 12:14 PM, Alexander Belopolsky <span dir="ltr"><<a href="mailto:alexander.belopolsky@gmail.com" target="_blank">alexander.belopolsky@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 class="gmail_extra"><div class="gmail_quote"><span class=""><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div>utc_time = f( location, utc_time )</div><div><br></div><div>These are two different problems, and one is much harder than the other! (though both are ugly!)</div></blockquote></span></div><br>You probably meant "utc_time = f( location, wall_time)" in the last equation,</div></div></blockquote><div><br></div><div>oops, yes.</div><div>Â </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"> but that would still be wrong.</div></div></blockquote><div>Â <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra">A somewhat more correct equation would be</div><div class="gmail_extra"><br></div><div class="gmail_extra">utc_time = f^(-1)( location, wall_time)</div></div></blockquote><div><br></div><div>In this case I meant "f" as "a function of", so the two fs were not intended to be the same. Yes, one is the inverse of another, and in this case the inverse is not definable (at least not uniquely).</div><div><br></div><div>I have no doubt you understand all this (better than I do), I'm just suggesting that in the discussion we find a way to be as clear as possible as to which function is being discussed when.</div><div><br></div><div>But anyway -- thanks all for hashing this out -- getting something reasonable into datetime will be very nice.</div><div><br></div><div>-Chris</div><div><br></div><div><br></div></div>-- <br><div class="gmail_signature"><br>Christopher Barker, Ph.D.<br>Oceanographer<br><br>Emergency Response Division<br>NOAA/NOS/OR&R Â Â Â Â Â Â (206) 526-6959Â Â voice<br>7600 Sand Point Way NE Â Â (206) 526-6329Â Â fax<br>Seattle, WA Â 98115 Â Â Â Â (206) 526-6317Â Â main reception<br><br><a href="mailto:Chris.Barker@noaa.gov" target="_blank">Chris.Barker@noaa.gov</a></div>
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