Attached a patch for the rrd-tool LIBDBI integration with the following improvements:

[rrdtool.git] / doc / rpntutorial.pod

diff --git a/doc/rpntutorial.pod b/doc/rpntutorial.pod
index 9829eb8..b3beac1 100644 (file)
--- a/doc/rpntutorial.pod
+++ b/doc/rpntutorial.pod
@@ -2,8 +2,6 @@
 
 rpntutorial - Reading RRDtool RPN Expressions by Steve Rader
 
 
 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
 =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"
 
 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
 
 
 =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
  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
  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":
 
 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":
 
 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
  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
 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.
 
 
     times operators alter the order of their evaluation.