X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frpntutorial.pod;h=b3beac1ded0735012874a4340affb79b1a833e38;hb=a6f5f1b6b90008e73fa57882276bc643c039bb09;hp=9829eb82b8476106b5017fb92406f34e903d5c91;hpb=4b7345f9345915c8061e4b37b26ce8887828c973;p=rrdtool.git

diff --git a/doc/rpntutorial.pod b/doc/rpntutorial.pod
index 9829eb8..b3beac1 100644
--- a/doc/rpntutorial.pod
+++ b/doc/rpntutorial.pod
@@ -2,8 +2,6 @@
 
 rpntutorial - Reading RRDtool RPN Expressions by Steve Rader
 
-=for html <div align="right"><a href="rpntutorial.pdf">PDF</a> version.</div>
-
 =head1 DESCRIPTION
 
 This tutorial should help you get to grips with RRDtool RPN expressions
@@ -26,7 +24,7 @@ RPN expression 2,1,GT evaluates to 1.
 
 Now consider "2,1,LE".  This RPN expression could be read as "is
 two less than or equal to one?".   The natural response is "no"
-and thus the RPN expression 2,1,LE evaluates to 0. 
+and thus the RPN expression 2,1,LE evaluates to 0.
 
 =head1 Reading the IF Operator
 
@@ -78,7 +76,7 @@ with multiple logic operators:
  1) 20,10,GT,10,20,IF  eval is 20,10,GT = 1     result is 1,10,20,IF
 
 read the eval as pop "20 is greater than 10" so push 1
- 
+
  2) 1,10,20,IF         eval is 1,10,20,IF = 10  result is 10
 
 read pop "if 1 then 10 else 20" so push 10.  Only 10 is left so
@@ -96,15 +94,11 @@ multiplication operator:
 Now let's go back to the first example of multiple logic operators,
 but replace the value 20 with the variable "input":
 
-=for comment
-XXX wo kommt das A ploetzlich her? Hier braucht es einen Satz, dass A als
-XXX placeholder  zum Lesbarmachen verwendet wird (shortcut).
-
- 1) input,10,GT,10,input,IF  eval is input,10,GT  result is A
+ 1) input,10,GT,10,input,IF  eval is input,10,GT  ( lets call this A )
 
 Read eval as "if input > 10 then true" and replace "input,10,GT"
 with "A":
-  
+
  2) A,10,input,IF            eval is A,10,input,IF
 
 read "if A then 10 else input".  Now replace A with it's verbose
@@ -145,7 +139,7 @@ traditional notation.  Explain why they have different answers.
 Answer 1:
 
     3*2+1 = 7 and 3*(2+1) = 9.  These expressions have
-    different answers because the altering of the plus and 
+    different answers because the altering of the plus and
     times operators alter the order of their evaluation.