[rrd-users] Accuracy while drawing pictures?

[Daniel Tepas]

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Hi all,

I am collecting temperature values from 4 sensors with 2 computers.
One of them copies the rrd file to the other, where thew graphs are
generated.
The two temperatures from one computer are plotted in arbitrary
precision, the other two values are cut down to integer values.
With rrdtool dump I checked that both rrds contain floating point values.
Any explanation for this?

TIA, Daniel

rrdtool dump /usr/local/rrdtool/temp1.rrd | less
[...]
<!-- 2006-10-28 11:05:00 CEST / 1162026300 --> <row><v>
1.9938386336e+01 </v></row>
<!-- 2006-10-28 11:10:00 CEST / 1162026600 --> <row><v>
1.9881528965e+01 </v></row>
<!-- 2006-10-28 11:15:00 CEST / 1162026900 --> <row><v>
1.9938179031e+01 </v></row>
<!-- 2006-10-28 11:20:00 CEST / 1162027200 --> <row><v>
1.9881780851e+01 </v></row>

rrdtool dump /usr/local/rrdtool/rio/temp1.rrd | less
[...]
<!-- 2006-10-26 13:40:00 CEST / 1161862800 --> <row><v>
2.2190000000e+01 </v></row>
<!-- 2006-10-26 13:45:00 CEST / 1161863100 --> <row><v>
2.2224600000e+01 </v></row>
<!-- 2006-10-26 13:50:00 CEST / 1161863400 --> <row><v>
2.2250000000e+01 </v></row>


/usr/bin/rrdtool graph /var/www/rrd/temp.day.png $OPTIONS -A --start
- -86400 \
DEF:temp0=/usr/local/rrdtool/rio/temp0.rrd:temp:AVERAGE \
DEF:temp1=/usr/local/rrdtool/rio/temp1.rrd:temp:AVERAGE \
DEF:temp2=/usr/local/rrdtool/temp0.rrd:temp:AVERAGE \
DEF:temp3=/usr/local/rrdtool/temp1.rrd:temp:AVERAGE \
LINE1:temp0#008800:"Draußen" \
LINE1:temp1#bb0000:"Partykeller" \
LINE1:temp3#0066ff:"Wohnzimmer" \
LINE1:temp2#44ff44:"Büro Daniel"

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