[rrd-users] help with cdef

winkey rush at winkey.oompah.org
Sat Aug 14 19:20:16 MEST 2004

i cannot seem to figure this out, i get results i do not expect

rrdtool graph \
        /home/rush/public_html/weather/metar/dir.gif \
        --color=BACK#FFFFCC \
        --color=CANVAS#CCFFFF \
        --title="Daily Wind Direction" \
        --width=300 \
        DEF:dir=/home/rush/public_html/weather/metar/weather.rrd:winddir:AVERAGE \
        DEF:speed=/home/rush/public_html/weather/metar/weather.rrd:windspeed:AVERAGE \
        CDEF:calm=speed,0,EQ \
        CDEF:mydir=calm,UNKN,dir,IF \

basicly if speed is zero i want an unknown value for direction but i
seem to be ending up with unknowns for speeds greater than zero and
other anomolys

winkey <rush at winkey.oompah.org>

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