X-Git-Url: https://git.octo.it/?p=rrdtool.git;a=blobdiff_plain;f=doc%2Frrdgraph_rpn.src;fp=doc%2Frrdgraph_rpn.src;h=ae1a91b80b62eaaaf374c8def1e336681c634619;hp=b765f9abc8ee86802b3f5c7835e75ccfbbe957bd;hb=0209ff81818995fcd2e2b7080c0ca504fa14d949;hpb=da83a2026d3844a843ff28bec6317369bb82a738

diff --git a/doc/rrdgraph_rpn.src b/doc/rrdgraph_rpn.src
index b765f9a..ae1a91b 100644
--- a/doc/rrdgraph_rpn.src
+++ b/doc/rrdgraph_rpn.src
@@ -94,9 +94,9 @@ B<+, -, *, /, %>
 
 Add, subtract, multiply, divide, modulo
 
-B<SIN, COS, LOG, EXP>
+B<SIN, COS, LOG, EXP, SQRT>
 
-Sine, cosine (input in radians), log, exp (natural logarithm)
+Sine, cosine (input in radians), log, exp (natural logarithm), square root
 
 B<ATAN>
 
@@ -108,6 +108,18 @@ Round down,up to the nearest integer
 
 Z<>
 
+=item Ordering Operations
+
+B<SORT, REV>
+
+Pop one element from the stack.  This is the I<count> of items to be sorted
+(or reversed).  The top I<count> of the remaining elements are then sorted
+(or reversed) in place on the stack.
+
+Example: C<CDEF:x=v1,v2,v3,v4,v5,v6,6,SORT,POP,5,REV,POP,+,+,+,4,/> will
+compute the average of the values v1..v6 after removing the smallest and
+largest.
+
 =item Special values
 
 B<UNKN>