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This patch ensures that when rrdcached is stopped, it cleans up the
[rrdtool.git]
/
doc
/
rrdgraph_rpn.pod
diff --git
a/doc/rrdgraph_rpn.pod
b/doc/rrdgraph_rpn.pod
index
b2a84dd
..
aabd738
100644
(file)
--- a/
doc/rrdgraph_rpn.pod
+++ b/
doc/rrdgraph_rpn.pod
@@
-99,6
+99,11
@@
B<+, -, *, /, %>
Add, subtract, multiply, divide, modulo
Add, subtract, multiply, divide, modulo
+B<ADDNAN>
+
+NAN-safe addition. If one parameter is NAN/UNKNOWN it'll be treated as
+zero. If both parameters are NAN/UNKNOWN, NAN/UNKNOWN will be returned.
+
B<SIN, COS, LOG, EXP, SQRT>
Sine and cosine (input in radians), log and exp (natural logarithm),
B<SIN, COS, LOG, EXP, SQRT>
Sine and cosine (input in radians), log and exp (natural logarithm),
@@
-150,7
+155,7
@@
average, ignoring all UNKNOWN values in the process.
Example: C<CDEF:x=a,b,c,d,4,AVG>
Example: C<CDEF:x=a,b,c,d,4,AVG>
-B<TREND>
+B<TREND
, TRENDNAN
>
Create a "sliding window" average of another data series.
Create a "sliding window" average of another data series.
@@
-174,6
+179,12
@@
average is essentially computed as shown here:
Value at sample (t1) will be the average between (t1-delay) and (t1)
Value at sample (t2) will be the average between (t2-delay) and (t2)
Value at sample (t1) will be the average between (t1-delay) and (t1)
Value at sample (t2) will be the average between (t2-delay) and (t2)
+TRENDNAN is - in contrast to TREND - NAN-safe. If you use TREND and one
+source value is NAN the complete sliding window is affected. The TRENDNAN
+operation ignores all NAN-values in a sliding window and computes the
+average of the remaining values.
+
+
=item Special values
B<UNKN>
=item Special values
B<UNKN>
@@
-251,6
+262,12
@@
the first occurrence of that value in the time component.
Example: C<VDEF:avg=mydata,AVERAGE>
Example: C<VDEF:avg=mydata,AVERAGE>
+=item STDEV
+
+Returns the standard deviation of the values.
+
+Example: C<VDEF:stdev=mydata,STDEV>
+
=item LAST, FIRST
Return the last/first value including its time. The time for
=item LAST, FIRST
Return the last/first value including its time. The time for