time on it's own does not work

[rrdtool.git] / doc / cdeftutorial.pod

diff --git a/doc/cdeftutorial.pod b/doc/cdeftutorial.pod
index 6a45ef4..b2016a2 100644 (file)
--- a/doc/cdeftutorial.pod
+++ b/doc/cdeftutorial.pod
@@ -12,7 +12,7 @@ adding it to this document would benefit most users, please do ask me
 to add it.  I will then try to provide an answer in the next release
 of this tutorial.  No feedback equals no changes! Additions to
 this document are also welcome.  -- Alex van den Bogaerdt
-E<lt>alex@ergens.op.het.netE<gt>
+E<lt>alex@vandenbogaerdt.nlE<gt>
 
 =head2 Why this tutorial?
 
@@ -617,7 +617,7 @@ numbers (or zero) only.
 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:
@@ -749,7 +749,7 @@ as follows:
    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" \
@@ -862,7 +862,7 @@ You may do some complex data filtering:
 
     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
@@ -875,7 +875,7 @@ This document was created from questions asked by either myself or by
 other people on the RRDtool mailing list. Please let me know if you
 find errors in it or if you have trouble understanding it. If you
 think there should be an addition, mail me:
-E<lt>alex@ergens.op.het.netE<gt>
+E<lt>alex@vandenbogaerdt.nlE<gt>
 
 Remember: B<No feedback equals no changes!>
 
@@ -886,4 +886,4 @@ The RRDtool manpages
 =head1 AUTHOR
 
 Alex van den Bogaerdt
-E<lt>alex@ergens.op.het.netE<gt>
+E<lt>alex@vandenbogaerdt.nlE<gt>