Hi there,
Does anyone know why this fails:
rrdtool graph /path/to/outputimage/rrd.png \
--interlaced --imgformat PNG --end 1289434618 --start 1286756217 \
--width 600 --height 200 --title 'TEST' \
DEF:dt=/path/to/dt.rrd:dt:AVERAGE \
VDEF:dtfoo=dt,MAXIMUM \
CDEF:dtmaxdiff=dtfoo,16,- \
LINE1:dtmaxdiff#990000:'TESTFOO' \
GPRINT:dt:LAST:'Latest value for TESTFOO\: %4.0lf%s\j'
The output I get from rrdtool is:
ERROR: rpn expressions without DEF or CDEF variables are not supported
If I try and add backslashes to the path (a la
http://www.mrtg.org/rrdtool/doc/rrdgraph_rpn.en.html, note between the VDEF and
CDEF rpn command there is not a carriage return anymore, just whitespace and a
backslash):
rrdtool graph /path/to/outputimage/rrd.png \
--interlaced --imgformat PNG --end 1289434618 --start 1286756217 \
--width 600 --height 200 --title 'TEST' \
DEF:dt=/path/to/dt.rrd:dt:AVERAGE \
VDEF:dtfoo=dt,MAXIMUM \ CDEF:dtmaxdiff=dtfoo,16,- \
LINE1:dtmaxdiff#990000:'TESTFOO' \
GPRINT:dt:LAST:'Latest value for TESTFOO\: %4.0lf%s\j'
I now get the output:
ERROR: Could not make sense out of ' CDEF:dtmaxdiff=dtfoo,16,-'
What I want is to find the maximum value for the data set ('dtfoo =
dt,MAXIMUM'), then take that value and subtract 16 from it (dtmaxdiff =
dtfoo,16,-), then plot that value.
Any ideas why both of these fail?
Thanks in advance,
- Rob_______________________________________________
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