User talk:Keta

Basque Portal?
Kaixo, I'm contacting you because you figure in Category:User eu, meaning that you speak some Basque. You must therefore be Basque yourself or have an intense connection with the Basque Country.

I am thinking that maybe was a good idea to create a Portal (or maybe a Wikiproject? or both?) on the Basque theme but I feel such kind of project requires more than just one person.

If you are interested, please comment in my talk page.

Enjoy, --Sugaar 10:27, 4 November 2006 (UTC)

Binomial calc
If you look at the cited reference, you'll see that the point of those examples is to demonstrate the difference between a straight recursion and a dynamic programming implementation, certainly not to provide good algorithms for binomial coefficients. The straight recursive implementation is a textbook example of how not to use recursion (and I am a Lisp guy from way back), and the dynamic programming implementation is still silly as a practical algorithm. As the cited reference shows, the D.P. implementation takes O(n^2) time -- and also O(n^2) space! -- whereas the standard loop takes only O(n) time and O(1) space (all assuming that numbers are fixed-size). --Macrakis (talk) 22:40, 28 July 2008 (UTC)

There is no 'algorithm' in the article, just some C code (with strange choice of data types). But its basic approach is fine -- but it's better to parenthesize as (accum*(n-k+i))/i. Why would you think there's a better algorithm? --Macrakis (talk) 21:12, 29 July 2008 (UTC)

Francis Xavier
Check the Talk. Thank you. --Karljoos (talk) 21:41, 29 March 2009 (UTC)

re: ion drive
It's an energy thing. The problem is that if the negative charge is allowed to build up, when the voltage on the spacecraft (relative to infinity) reaches the potential difference across the grid-anode, then the positive ions don't have enough energy to escape the negative attraction of the spacecraft; they would go in a wide orbit, and most of them would smack back into the spacecraft.

This would be bad; you'd have no net propulsion, and the ions would erode the spacecraft.TooComplicated (talk) 15:44, 6 August 2012 (UTC)