Let's compile the complete CDEF:
DEF:ds0=router1.rrd:AVERAGE
- CDEF:ds0modified=TIME,begintime,GE,TIME,endtime,LE,*,UNKN,ds0,IF
+ CDEF:ds0modified=TIME,begintime,GT,TIME,endtime,LE,*,ds0,UNKN,IF
This will return the value of ds0 if both comparisons return true. You
could also do it the other way around:
5. push 32
6. push function "plus" and process it
the stack contains now the temperature in Fahrenheit
-
+
=head2 Changing unknown into zero
rrdtool graph demo.png --title="Demo Graph" \