DevForce Community Forum : Reverse Polish Notation Question http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : Reverse Polish Notation Question Wed, 10 Jun 2026 12:50:50 -700 Mon, 26 Apr 2010 11:42:48 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=1745 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Reverse Polish Notation Question : Originally posted by smi-markThat's... http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6656#6656 Author: GregD
Subject: 1745
Posted: 26-Apr-2010 at 11:42am

Originally posted by smi-mark

That's a great chart, Greg. I still have several projects in DevForce Classic, and it really makes you appreciate LINQ queries in EF!!!


Reverse Polish does have a sort of Vulcan beauty to it; but yeah, I'd have to go with LINQ.  8-)
]]> Mon, 26 Apr 2010 11:42:48 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6656#6656 Reverse Polish Notation Question : Thanks, that's just what... http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6641#6641 Author: evanian
Subject: 1745
Posted: 26-Apr-2010 at 1:22am

Thanks, that's just what I needed.  I didn't realise that the rule was "the operator always applies to the two most recently listed operands".  It finally makes full sense of the table :)]]> Mon, 26 Apr 2010 01:22:10 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6641#6641 Reverse Polish Notation Question : That's a great chart, Greg.... http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6637#6637 Author: smi-mark
Subject: 1745
Posted: 23-Apr-2010 at 6:43pm

That's a great chart, Greg. I still have several projects in DevForce Classic, and it really makes you appreciate LINQ queries in EF!!!]]> Fri, 23 Apr 2010 18:43:35 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6637#6637 Reverse Polish Notation Question : That's a bit of a nasty... http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6633#6633 Author: GregD
Subject: 1745
Posted: 23-Apr-2010 at 5:56pm

That's a bit of a nasty one, but I think with a little study of the table below (from the Object Persistence chapter of the Developers Guide) you will see how to write your query.  You have, algebraically,

    A and ((B and C) or (D and E)) and F

So I believe that translates to

   A BC and DE and or and F and

The operator always applies to the two most recently listed operands.

Algebraic Notation v. Reverse-Polish

The following table compares algebraic notation to the corresponding Reverse-Polish notation.  If you’re accustomed to thinking algebraically, as many of us are, just find the relationships you need in the left-hand column and see the Reverse-Polish equivalent in the right-hand column.  Not every possible construction is covered, but with a few minutes of meditation – as especially, with comparison to the examples given above -- you’ll get the idea.




Edited by GregD - 23-Apr-2010 at 6:00pm]]> Fri, 23 Apr 2010 17:56:21 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6633#6633 Reverse Polish Notation Question : I am just... http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6619#6619 Author: evanian
Subject: 1745
Posted: 23-Apr-2010 at 9:23am

I am just getting into OQL and I need to build a query of the following algebraic form:

Condition1 AND ((Condition2 AND Condition3) OR (Condition4 AND Condition5)) AND Condition6

Is there a way of doing this?

Any help would be greatly appreciated!
]]> Fri, 23 Apr 2010 09:23:27 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1745&PID=6619#6619