<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style id="owaParaStyle" type="text/css">P {margin-top:0;margin-bottom:0;}</style>
</head>
<body ocsi="0" fpstyle="1">
<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Sounds what you want is the Holt-Winters Aberrant Behaviour detection.<br>
<br>
To get this, you need to define the normal pattern cycle (in this case, probably weekly)and define the special HW RRAs in the RRD file. Read up on the HW support in the RRD documentation, as its far too complex to fully exlain here.<br>
<br>
Steve<br>
<div><br>
<div style="font-family: Tahoma; font-size: 13px;">
<div style="font-family: Tahoma; font-size: 13px;"><strong>Steve Shipway</strong></div>
<div style="font-family: Tahoma; font-size: 13px;">University of Auckland ITS</div>
<div style="font-family: Tahoma; font-size: 13px;"><em>UNIX Systems Design Lead</em></div>
<div style="font-family: Tahoma; font-size: 13px;"><a href="mailto:s.shipway@auckland.ac.nz">s.shipway@auckland.ac.nz</a></div>
<div style="font-family: Tahoma; font-size: 13px;">Ph: +64 9 373 7599 ext 86487</div>
<div style="font-family: Tahoma; font-size: 13px;"><em></em> </div>
</div>
</div>
<div style="font-family: Times New Roman; color: rgb(0, 0, 0); font-size: 16px;">
<hr tabindex="-1">
<div style="direction: ltr;" id="divRpF455621"><font color="#000000" face="Tahoma" size="2"><b>From:</b> rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch] on behalf of Michel de Lange [michel_de_lange@yahoo.co.uk]<br>
<b>Sent:</b> Monday, 9 May 2011 8:21 p.m.<br>
<b>To:</b> rrd-users@lists.oetiker.ch<br>
<b>Subject:</b> [rrd-users] Showing the average for a specific time period<br>
</font><br>
</div>
<div></div>
<div>
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: tahoma,new york,times,serif; font-size: 14pt;">
<div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;">Dear experts,</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;">I am monitoring the number of users of applications, and I want to show the actual number and the average number at that point
in time. So I have my data every 10 minutes, and I want to show how the data for now compares with the data, which is normal (average), for example, for Monday at 10:20. How do I go about doing that?</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;">I could create variables in the database for this peculiar average, and maintain it myself: Every time I write to the database,
I recalculate this average. But I wonder whether RRDtool can do it for me?</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;">With kind regards, and thank you for your attention,</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;"><br>
</span></font></div>
<div><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><span class="Apple-style-span" style="font-size: 19px;">Michel</span></font></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>