<span class="HcCDpe">Hi </span>
Jeff,<br>Please check the (un-replyed till now) message<br><span class="HcCDpe">Wed, Mar 19, 2008 at 3:17 PM<br><br></span><a href="https://lists.oetiker.ch/pipermail/rrd-users/2008-March/013860.html">[rrd-users] Rate Of Change question</a><a name="13860"></a><br>
<span class="HcCDpe"><a href="https://lists.oetiker.ch/pipermail/rrd-users/2008-March/013860.html">https://lists.oetiker.ch/pipermail/rrd-users/2008-March/013860.html</a><br></span><br>hope this helps the setup. still i hope someone enlightens the ROC question.<br>
<br><br><div class="gmail_quote">On Thu, Apr 17, 2008 at 4:31 AM, jrshenk <<a href="mailto:jeff_1158@yahoo.com">jeff_1158@yahoo.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
Hi,<br>
<br>
I am graphing barometric pressure, with the graph showing a two day period.<br>
I would like use gprint to add the rate of change over the last hour to the<br>
graph. I would like to take the value from 1 hour ago and subtract the LAST<br>
value. The trouble I am having is getting the value from 1 hour ago. Below<br>
is what I am trying to do:<br>
<br>
VDEF:last=pressure,LAST GPRINT:last:"Current=%4.2lf%s" \<br>
CDEF:old=pressure,LAST-1h<br>
VDEF:ROC=old,LAST,- GPRINT:ROC:"Change=%4.2lf%s" \<br>
<br>
But I am unsure how to get the value from 1 hour ago. which is what I was<br>
hoping "CDEF:old=pressure,LAST-1h" would accomplish.<br>
Thanks in advance for any help,<br>
<br>
Jeff<br>
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