[rrd-users] Calculating rate of change from gauge

[Marius Rugan]

Hi Jeff,
Please check the (un-replyed till now) message
Wed, Mar 19, 2008 at 3:17 PM

[rrd-users] Rate Of Change
question<https://lists.oetiker.ch/pipermail/rrd-users/2008-March/013860.html>
https://lists.oetiker.ch/pipermail/rrd-users/2008-March/013860.html

hope this helps the setup. still i hope someone enlightens the ROC question.


On Thu, Apr 17, 2008 at 4:31 AM, jrshenk <jeff_1158 at yahoo.com> wrote:

>
> Hi,
>
> I am graphing barometric pressure, with the graph showing a two day
> period.
> I would like use gprint to add the rate of change over the last hour to
> the
> graph. I would like to take the value from 1 hour ago and subtract the
> LAST
> value. The trouble I am having is getting the value from 1 hour ago.
>  Below
> is what I am trying to do:
>
> VDEF:last=pressure,LAST GPRINT:last:"Current=%4.2lf%s" \
> CDEF:old=pressure,LAST-1h
> VDEF:ROC=old,LAST,- GPRINT:ROC:"Change=%4.2lf%s" \
>
> But I am unsure how to get the value from 1 hour ago. which is what I was
> hoping "CDEF:old=pressure,LAST-1h" would accomplish.
> Thanks in advance for any help,
>
> Jeff
>
>
> --
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> Sent from the RRDTool - User mailing list archive at Nabble.com.
>
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