time on it's own does not work

[rrdtool.git] / doc / cdeftutorial.pod

diff --git a/doc/cdeftutorial.pod b/doc/cdeftutorial.pod
index 1c17046..b2016a2 100644 (file)
--- a/doc/cdeftutorial.pod
+++ b/doc/cdeftutorial.pod
@@ -862,7 +862,7 @@ You may do some complex data filtering:
 
     DEF:var=database.rrd:traffic:AVERAGE
     CDEF:prev1=PREV(var)
 
     DEF:var=database.rrd:traffic:AVERAGE
     CDEF:prev1=PREV(var)

-    CDEF:time=TIME
+    CDEF:time=var,POP,TIME

     CDEF:prevtime=PREV(time)
     CDEF:derivate=var,prev1,-,time,prevtime,-,/
     LINE3:derivate#000077:derivate
     CDEF:prevtime=PREV(time)
     CDEF:derivate=var,prev1,-,time,prevtime,-,/
     LINE3:derivate#000077:derivate