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Dive Into q | me, q and kdb+
https://lifeisalist.wordpress.com/dive-into-q
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. To start your adventure in the amazing world of q. Download the trial version of kdb. For the platform you like. Installation is fast and easy. Simply extract the archive to the prefered location. However, on Windows. Finally, add kdb to the system path so you can run it with. Depends on platform the system path must point to: w32/. In command prompt or terminal window run:. It means that you are working within. Takes the following steps:.
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FD Lectures | me, q and kdb+
https://lifeisalist.wordpress.com/dive-into-q/fd-lectures
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Multi-Partitioned kdb Databases: An Equity Options Case Study. Order Book: a kdb Intra-Day Storage and Access Methodology. Kdb Data Management: Sample Customisation Techniques. Market Fragmentation: A kdb Framework for Multiple Liquidity Sources. Columnar Database and Query Optimization. Transaction Cost Analysis Using kdb. Common Design Principles for kdb Gateways. The Application of Foreign Keys and Linked Columns in kdb. An Interview wit...
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q tips & tricks | me, q and kdb+
https://lifeisalist.wordpress.com/q-tips-tricks
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Q tips & tricks. Clever trick with exec. Geeky table’s schema definition. Getting day of the week. User accounts in kdb. Command line arguments and regular expressions. Mystery of functional select. Leave a Reply Cancel reply. Enter your comment here. Fill in your details below or click an icon to log in:. Address never made public). You are commenting using your WordPress.com account. ( Log Out. Notify me of new comments via email.
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P38: Compare the two methods of calculating Euler’s totient function | me, q and kdb+
https://lifeisalist.wordpress.com/2012/06/30/p38-compare-the-two-methods-of-calculating-eulers-totient-function
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. P38: Compare the two methods of calculating Euler’s totient function. Is a list of Prolog. Challenges with solutions in Lisp. However, the solutions you can find here are written in. Use the solutions of problems P34. To compare the algorithms. Take the number of logical inferences as a measure for efficiency. Try to calculate phi(10090) as an example. P34 vs. P37. It seems that totientPhi2. Is faster (avg. time = 0.1 ms):. Next post →.
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quicksort in q | me, q and kdb+
https://lifeisalist.wordpress.com/2014/11/21/quicksort-in-q
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Something Attila showed during the recent London kx meetup:. X;x; raze. X where each not scan. Short and sweet implementation of quicksort. It is slower than q built-ins but obviously it is hard to beat q…. If you are wondering why he didn’t use .z.s. For recursion, the answer is very simple – he was aiming for the shortest implementation. Leave a Reply Cancel reply. Enter your comment here. Address never made public). Next post →.
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FD Lecture Series | me, q and kdb+
https://lifeisalist.wordpress.com/2013/02/18/fd-lecture-series
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Has published so far four q for Gods lectures. Covering .e.g. kdb data management, storage and access methodology. One thought on “ FD Lecture Series. February 18, 2013 at 8:59 pm. This is really helpful for those of us who are learning Q/KDB on their own. Thank you very much. Leave a Reply Cancel reply. Enter your comment here. Fill in your details below or click an icon to log in:. Address never made public). Next post →.
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Karatsuba Multiplication | me, q and kdb+
https://lifeisalist.wordpress.com/2014/11/12/karatsuba-multiplication
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Is a fast multiplication algorithm which is significantly faster then the good old classical algorithm. We know from school. For example to compute product of two 1024-digit numbers, we normally need around 1,000,000 single-digit multiplications. With Karatsuba algorithm. That number drops to around 59k. So here is my one-liner:. 10;n]-c;1-c;c); prd each. D;m;d m:(x;y)-c*d:(x;y) div. N: max count each string abs. Leave a Reply Cancel reply.
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Let’s Meetup in London – Nov 19th | me, q and kdb+
https://lifeisalist.wordpress.com/2014/11/13/kx-london-meetup-on-nov-19th
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. Let’s Meetup in London – Nov 19th. As some of you may know, few moths ago a kx London meetup. Group was started and now it is organizing another event. Taking into account that speakers include Simon Garland. The evening looks promising. Leave a Reply Cancel reply. Enter your comment here. Fill in your details below or click an icon to log in:. Address never made public). You are commenting using your WordPress.com account. ( Log Out.
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Coding Rules | me, q and kdb+
https://lifeisalist.wordpress.com/dive-into-q/coding-rules
Me, q and kdb. Weblog about learning q and kdb. Q tips & tricks. 8230; for mortals. Explicit is better than implicit. I really don’t like to work with code that follows random coding rules or something that looks like coding rules for hard-cores. Instead of concentrating on what the code does, I spend my time on finding out where one expression ends and another one starts, whether it is a local or global variable and is that still. If you feel the same about q coding, you should know that using. And I al...
