[rrd-users] MIN AVG MAX LAST Values

[Simon Pickard]

Hello,

I am using rrdtool to graph reading from various temp sensors.

If a value goes between 0.00 & -0.99 the MIN AVG MAX or LAST values shown
on the graph read as 876m for example rather than the degree reading.

Here is the code to create the graph...

rrdtool graph $DIR/flue_temp_hourly_60.png \
--start -4h \
--end=now \
--title="$TITLE" \
--imgformat=PNG \
--width=800 \
--base=1000 \
--height=240 \
--rigid \
--interlaced \
--slope-mode \
--vertical-label "Temperature (C)" \
--right-axis-label "Temperature (C)" \
--right-axis 1:0 \
"DEF:flueTemp=$DIR/28.18667B050000.rrd:t:AVERAGE" \
"DEF:outsideTemp=$DIR/28.73367C050000.rrd:t:AVERAGE" \
"DEF:temp=$DIR/28.18667B050000.rrd:t:AVERAGE" \
LINE2:flueTemp$TEMP1_COLOR:"Flue Temp    [deg $TEMP_SCALE]" \
VDEF:Flue_Temp_MIN=flueTemp,MINIMUM \
GPRINT:Flue_Temp_MIN:"Min\:%8.2lf%s" \
VDEF:Flue_Temp_AVERAGE=flueTemp,AVERAGE \
GPRINT:Flue_Temp_AVERAGE:"Avg\:%8.2lf%s" \
VDEF:Flue_Temp_MAX=flueTemp,MAXIMUM \
GPRINT:Flue_Temp_MAX:"Max\:%8.2lf%s" \
VDEF:Flue_Temp_LAST=flueTemp,LAST \
GPRINT:Flue_Temp_LAST:"LAST\:%8.2lf%s\n" \
\
LINE2:outsideTemp$OUTTEMP_COLOR:"Outside Temp [deg $TEMP_SCALE]" \
VDEF:Return_Temp_MIN=outsideTemp,MINIMUM \
GPRINT:Return_Temp_MIN:"Min\:%8.2lf%s" \
VDEF:Return_Temp_AVERAGE=outsideTemp,AVERAGE \
GPRINT:Return_Temp_AVERAGE:"Avg\:%8.2lf%s" \
VDEF:Return_Temp_MAX=outsideTemp,MAXIMUM \
GPRINT:Return_Temp_MAX:"Max\:%8.2lf%s" \
VDEF:Return_Temp_LAST=outsideTemp,LAST \
GPRINT:Return_Temp_LAST:"LAST\:%8.2lf%s\n"


Can anyone offer any suggestions as to why?
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