X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=doc%2Frrdgraph_rpn.pod;h=87fc8e666132a57524885f6f8e7ac7a49302078f;hb=HEAD;hp=5558c224b70c8e15bb3455911ebeb77158695abe;hpb=3b8e10c66bfeb447e8b06b7296f748c405c8453d;p=rrdtool.git

diff --git a/doc/rrdgraph_rpn.pod b/doc/rrdgraph_rpn.pod
index 5558c22..87fc8e6 100644
--- a/doc/rrdgraph_rpn.pod
+++ b/doc/rrdgraph_rpn.pod
@@ -157,6 +157,16 @@ average, ignoring all UNKNOWN values in the process.
 
 Example: C<CDEF:x=a,b,c,d,4,AVG>
 
+B<MEDIAN>
+
+pop one element (I<count>) from the stack. Now pop I<count> elements and find
+the median, ignoring all UNKNOWN values in the process. If there are an even
+number of non-UNKNOWN values, the average of the middle two will be pushed on
+the stack.
+
+Example: C<CDEF:x=a,b,c,d,4,MEDIAN>
+
+
 B<TREND, TRENDNAN>
 
 Create a "sliding window" average of another data series.
@@ -344,9 +354,8 @@ Example: C<VDEF:stdev=mydata,STDEV>
 
 =item LAST, FIRST
 
-Return the last/first value including its time.  The time for
-FIRST is actually the start of the corresponding interval, whereas
-LAST returns the end of the corresponding interval.
+Return the last/first non-nan or infinite value for the selected data
+stream, including its timestamp.
 
 Example: C<VDEF:first=mydata,FIRST>