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Live from HHC2009
Message #1 Posted by Namir on 3 Oct 2009, 10:02 a.m.

Hello All,

We are all here at HP's in Fort Collins, CO. The conference is about to begin!

:-)

Namir

      
Re: Live from HHC2009
Message #2 Posted by Johnny BJoern Rasmussen on 3 Oct 2009, 1:36 p.m.,
in response to message #1 by Namir

I hope that you'll have a good time.

Cheers! Johnny

      
Re: Live from HHC2009
Message #3 Posted by Walter B on 3 Oct 2009, 3:33 p.m.,
in response to message #1 by Namir

Enjoy!

And don't forget to tell us the news -- Ft. Collins is far, far away. In addition, economic conditions are a bit worse than last year at that time for whatever cause, the USA as a whole is counted here as "swine flue area", so long range travelling needs very good reasons ;)

      
Re: Live from HHC2009
Message #4 Posted by Juan J on 3 Oct 2009, 10:04 p.m.,
in response to message #1 by Namir

Hello there,

Enjoy and keep us posted.

JuanJ

      
Re: Live from HHC2009
Message #5 Posted by pascal on 4 Oct 2009, 1:26 a.m.,
in response to message #1 by Namir

Hello Namir, I wish you a good time there ! Greetings from Switzerland.

            
Re: Live from HHC2009
Message #6 Posted by Namir on 4 Oct 2009, 1:54 a.m.,
in response to message #5 by pascal

Thanks Pascal.

The first day was a veyr very long day. We left HP's office at 9:30 pm!! When we got to the hotel we had a second wind and sat in the reception area and chatted some more!

Cheers,

Namir

                  
Re: Live from HHC2009
Message #7 Posted by Don Shepherd on 4 Oct 2009, 8:33 a.m.,
in response to message #6 by Namir

Hmmm, sounds like no programming problem contest this year.

                        
Re: Live from HHC2009
Message #8 Posted by BruceH on 5 Oct 2009, 1:22 a.m.,
in response to message #7 by Don Shepherd

There was one, won by Roger Hill. My effort was hopelessly outclassed (this is what comes of starting it at midnight the night before it was due in). Bill Butler set the challenge - I'll leave him to repost it here when he gets home.

                        
Re: Live from HHC2009 (well, not quite live any more)
Message #9 Posted by Jeff O. on 5 Oct 2009, 1:38 p.m.,
in response to message #7 by Don Shepherd

It was specific to the 50G:

HHC 2009 Programming Challenge

Finding partial sums of rows of Pascal's Triangle

         1
        1 1
       1 2 1
      1 3 3 1
     1 4 6 4 1
        etc.

Write an HP50g program which takes a positive integer n of any size in level 2 and any integer r in level 1 and returns the sum of C(n,0) + C(n,1)+...+C(n,r) to level 1. The output should be 0 for r<0 and 2n for r >= n.

The program will be transferred from your HP50g to the judges' HP50g and will be tested (in exact mode) for a selection of values of n and r chosen by the judges. The fastest program wins.

The usual rules apply:

- The program must be in user code only

- The program must be self-contained

- The program must leave the stack unchanged except for replacing n and r with the result.

- Default flag settings are assumed, except that RPN mode must be set. Flag settings must be restored if changed.

- The judges’ decision is final.

                              
Re: Live from HHC2009 (well, not quite live any more)
Message #10 Posted by Don Shepherd on 5 Oct 2009, 2:02 p.m.,
in response to message #9 by Jeff O.

Thanks Jeff.

                              
Re: Live from HHC2009 (well, not quite live any more)
Message #11 Posted by Allen on 6 Oct 2009, 8:21 p.m.,
in response to message #9 by Jeff O.

FWIW, I made a smaller binomial sum of products:

http://www.wolframalpha.com/input/?i=sum+%28-1^j%29*binomial%28+n%2Br-2j%2C+r-j%29*binomial%28n%2Br-3j%2Cr-2j%29%2C+j%3D0+to+r%2F2%2C+r%3D13%2C+n%3D8

to satisfy the programming contest.. there's some interesting limitations of it, but should work for all rows under row 30.

It steps through pascals triangle like a knight in a chess board:

I can walk you through the recursion for getting there.. took me about 15 hours without my "Concrete Mathematics" book. The internet wasn't much help either...

Edited: 6 Oct 2009, 8:57 p.m.

      
Re: Live from HHC2009
Message #12 Posted by Howard Lazerson on 4 Oct 2009, 7:32 p.m.,
in response to message #1 by Namir

dont forget to ask when the new enhanced 42s will be available

      
Live from HHC2009: any online info so far?
Message #13 Posted by Vieira, Luiz C. (Brazil) on 5 Oct 2009, 2:34 a.m.,
in response to message #1 by Namir

Hi Namir, guys;

congratulations, all of you. Good to know that you, people, are there.

I am not sure if this is common knowledge, but I would like to ask, please, as soon as any online information about the meeting is available, would you let us know? If any already, which links?

Thanks again.

Luiz (Brazil)

      
Re: Live from HHC2009
Message #14 Posted by Thomas Chrapkiewicz on 5 Oct 2009, 7:08 p.m.,
in response to message #1 by Namir

Hello Namir:

Would you be able to post a XL 2003 compatible version of RPN2?

Thanks, TomC

            
Re: Live from HHC2009
Message #15 Posted by Namir on 5 Oct 2009, 9:28 p.m.,
in response to message #14 by Thomas Chrapkiewicz

Tom,

Send me email to:

n.s.h.a.m.m.a.s@aol.com (remove the dots before the @ sign)

I will email you an Excel 2003 version of RPN2.

Regards,

Namir

PS: Thanks for the rides to and from the conference!

Edited: 5 Oct 2009, 9:28 p.m.

                  
Re: Live from HHC2009
Message #16 Posted by Thomas Chrapkiewicz on 6 Oct 2009, 10:35 a.m.,
in response to message #15 by Namir

Namir:

Thank you. It was a great pleasure spending time with you at the conference! Hope to see you again next time!

TomC


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