Re: [mrtg] temperature graphs averaging out wrong

Alex van den Bogaerdt wrote:
> On Fri, Apr 04, 2008 at 11:53:15AM +1300, Max wrote:
>
>
>> I am happy enough with the daily graphs, but I must be recording the
>> data wrong somewhere, as the graphs for longer periods are not showing
>> the Max or Min of the temperatures, but I suspect are averaging them out
>> over a longer period (i think).
>>
>> This is naturally one of those problems of the dam computer doing what I
>> ask it to do, rather than what I want it to do.
>>
>
> Indeed. You ask it to show averages.
>
>
Ok, I have made the alterations Alex suggested (hopefully I got them
like you expected, I think I understood what you were getting at), and I
have updated the list on the web page (
http://corporateturtles.com/tmp/200804041104/ )

I won't list all the changes for all the graphs, but I will list the old
and then the new below for the yearly graph...

#
# Graph for temperature, Dalmore, Dunedin
# -- YEAR
#
rrdtool graph /var/www/rrdtool/temperature-year.png \
DEF:in1=/var/www/rrdtool/temperature.rrd:internal:AVERAGE \
DEF:in2=/var/www/rrdtool/temperature.rrd:inside:AVERAGE \
DEF:out=/var/www/rrdtool/temperature.rrd:outside:AVERAGE \
VDEF:MaxIn1=in1,MAXIMUM \
VDEF:MinIn1=in1,MINIMUM \
VDEF:AvgIn1=in1,AVERAGE \
VDEF:CurrentIn1=in1,LAST \
VDEF:MaxIn2=in2,MAXIMUM \
VDEF:MinIn2=in2,MINIMUM \
VDEF:AvgIn2=in2,AVERAGE \
VDEF:CurrentIn2=in2,LAST \
VDEF:MaxOut=out,MAXIMUM \
VDEF:MinOut=out,MINIMUM \
VDEF:AvgOut=out,AVERAGE \
VDEF:CurrentOut=out,LAST \
COMMENT:"\t\t\tMax\t\t\t\t Min\t\t\t\t\t Average\t\t\t\tCurrent\n" \
AREA:in2#00FF00:"Inside" \
GPRINT:MaxIn2:"%8.2lf deg C" \
GPRINT:MinIn2:"\t\t%7.2lf deg C" \
GPRINT:AvgIn2:"\t\t\t%8.2lf deg C" \
GPRINT:CurrentIn2:"\t\t%8.2lf deg C\n" \
LINE1:out#FF0000:"Outside" \
GPRINT:MaxOut:"%7.2lf deg C" \
GPRINT:MinOut:"\t\t%7.2lf deg C" \
GPRINT:AvgOut:"\t\t\t%8.2lf deg C" \
GPRINT:CurrentOut:"\t\t%8.2lf deg C\n" \
--title "Temperature, Dalmore, Dunedin, New Zealand 9010" \
--base 1000 -r -X 0 \
-s -8760h -w 790 -l 0 --lazy





#
# Graph for temperature, Dalmore, Dunedin
# -- YEAR (mark 2)
#
rrdtool graph /var/www/rrdtool/temperature-year2.png \
DEF:in1now=/var/www/rrdtool/temperature.rrd:internal:AVERAGE \
DEF:in2now=/var/www/rrdtool/temperature.rrd:inside:AVERAGE \
DEF:outnow=/var/www/rrdtool/temperature.rrd:outside:AVERAGE \
DEF:in1min=/var/www/rrdtool/temperature.rrd:internal:MIN \
DEF:in2min=/var/www/rrdtool/temperature.rrd:inside:MIN \
DEF:outmin=/var/www/rrdtool/temperature.rrd:outside:MIN \
DEF:in1avg=/var/www/rrdtool/temperature.rrd:internal:AVERAGE \
DEF:in2avg=/var/www/rrdtool/temperature.rrd:inside:AVERAGE \
DEF:outavg=/var/www/rrdtool/temperature.rrd:outside:AVERAGE \
DEF:in1max=/var/www/rrdtool/temperature.rrd:internal:MAX \
DEF:in2max=/var/www/rrdtool/temperature.rrd:inside:MAX \
DEF:outmax=/var/www/rrdtool/temperature.rrd:outside:MAX \
VDEF:MaxIn1=in1max,MAXIMUM \
VDEF:MinIn1=in1min,MINIMUM \
VDEF:AvgIn1=in1avg,AVERAGE \
VDEF:CurrentIn1=in1now,LAST \
VDEF:MaxIn2=in2max,MAXIMUM \
VDEF:MinIn2=in2min,MINIMUM \
VDEF:AvgIn2=in2avg,AVERAGE \
VDEF:CurrentIn2=in2now,LAST \
VDEF:MaxOut=outmax,MAXIMUM \
VDEF:MinOut=outmin,MINIMUM \
VDEF:AvgOut=outavg,AVERAGE \
VDEF:CurrentOut=outnow,LAST \
COMMENT:"\t\t\tMax\t\t\t\t Min\t\t\t\t\t Average\t\t\t\tCurrent\n" \
AREA:in2max#00FF00:"Inside" \
GPRINT:MaxIn2:"%8.2lf deg C" \
GPRINT:MinIn2:"\t\t%7.2lf deg C" \
GPRINT:AvgIn2:"\t\t\t%8.2lf deg C" \
GPRINT:CurrentIn2:"\t\t%8.2lf deg C\n" \
LINE1:outmax#FF0000:"Outside" \
GPRINT:MaxOut:"%7.2lf deg C" \
GPRINT:MinOut:"\t\t%7.2lf deg C" \
GPRINT:AvgOut:"\t\t\t%8.2lf deg C" \
GPRINT:CurrentOut:"\t\t%8.2lf deg C\n" \
--title "Temperature, Dalmore, Dunedin, New Zealand 9010" \
--base 1000 -r -X 0 \
-s -8760h -w 790 -l 0 --lazy




I believe the graphs are correct now. My main giveaway before to the
fact that something was wrong was that my yearly MIN was a higher number
than my monthly MIN, and also my yearly MAX was lower than my monthly
MAX. With the new changes, this is no longer the case :)

Naturally, please let me know if you believe I have made any other mistakes.


Thanks Alex, and the rest of you that make this a fantastic list.


Max
Dunedin, NZ

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