Machine Learning and Big Data with kdb+/q offers quants, programmers, and algorithmic traders a practical entry into the powerful but non-intuitive kdb+ database and q programming language. Ideally designed to handle the speed and volume of high-frequency financial data at sell- and buy-side institutions, these tools have become the de facto standard; this book provides the foundational knowledge practitioners need to work effectively with this rapidly-evolving approach to analytical trading. There are some industries and companies that can’t and won’t help addicts. It’s not just dealers of illegal drugs who benefit from harmful addictions. Legitimate industries depend on addicts as well. For example, those ubiquitous ads for online games like Clash of Clans and Candy Crush are fishing for what the industry calls “ whales”—the 0.15 percent of players who bring in 50 percent of revenue. In an industry where the cost of acquiring players is barely less than the revenue generated per user, whales tip the scales to profitability. Without these extreme customers, their businesses aren’t viable. Tech companies owe it to their users simply to reach out and ask if they can be helpful, just as a concerned friend might do. Crafting doesn’t have to have a purpose. Sometimes it’s just fun to enjoy the creation process. If you are looking for a craft for the spring or summer season, though, this adorable craft is perfect. After these chapters, the user has already seen ample examples of the basics of the language, and has multiple working statistics functions and utilities in their toolbox! All of these books fall into different genres, yet all their opening lines do the same thing: capture the reader's attention. You can imitate them by making a similarly strong, slightly furtive statement in your opener!

A+ is an array programming language descended from the programming language A, which in turn was created to replace APL in 1988. Arthur Whitney developed the A portion of A+, while other developers at Morgan Stanley extended it, adding a graphical user interface and other language features. A+ is a high-level, interactive, interpreted language, designed for numerically intensive applications, especially those found in financial applications. A+ runs on many Unix variants, including Linux. It is free and open source software released under a GNU General Public License.You may already know what you want to write about, or you may be at a total loss. Either way, you can settle on a “big book idea” by asking yourself a few simple questions: Chapter2 starts by demonstrating how to install and run the q binary, as well as configure and customize the q environment. It then gives an example of typing commands at the prompt and explains how to recover from errors caused by incorrect syntax. The chapter finishes with an overview of a few of q's unique syntax rules.

Consider your conflict points. Conflict is at the heart of any good book — it draws in the reader, conjures tension and emotion, and ultimately reflects the themes and/or message you want to convey. You don't have to know exactly where your conflict will manifest, but you should have a pretty good grasp of how it works throughout your book. Q-tips are one of the most perplexing things for sale. Plenty of consumer products are widely used in ways other than their core function — books for levelling tables, newspapers for keeping fires aflame, seltzer for removing stains, coffee tables for resting legs — but these cotton swabs are distinct. Q-tips are one of the only major consumer products, if not the only, whose main purpose is precisely the one the manufacturer explicitly warns against. Based on ours and other writers' experience, here are a few motivational strategies for you to try: Jd (J database) is a high-performance columnar RDBMS written in J that is geared towards storing and analyzing large amounts of data. Jd is free for non-commercial use. Flaky earwax is often seen in people of Asian descent or as an effect of ageing, where it tends to become drier and flakier. It might also point to underlying issues like eczema or an ear infection if accompanied by itching or inflammation.

Take a short break to do something else. Yes, sometimes you need to step away from the keyboard and clear your head. But don't take more than a day or so, or else you'll lose momentum and motivation. The culmination of the previous chapters all lead up to this – combining the skills we have gained in starting/stopping a q process, creating modular functions and creating simulated high frequency data, we can now build our own CEP. As with many other learning experiences, I feel that the journey is more important than the destination, but it is very satisfying to see all the previous chapters combined into one very tight and robust system. This chapter also includes information on loading data from files and the various ways to do so, which is useful for any practical data analysis. The very useful reference card covers the keywords, operators, iterators, execution control, attributes, command-line options, system commands, datatypes, namespaces, and more: https://code.kx.com/q/ref/ The culmination of the previous chapters all lead up to this – combining the skills we have gained in starting/stopping a q process, creating modular functions and creating simulated high frequency data, we can now build our own CEP. As with many other learning experiences, I feel that the journey is more important than the destination, but it is very satisfying to see all the previous chapters combined into one very tight and robust system. This chapter also includes information on loading data from files and the various ways to do so, which is useful for any practical data analysis. Q-SQL Or if you're not much for outlines because your thoughts are all over the place, Milanote can help. The super-flexible interface allows you to “mind map” just as you would longhand, and rearrange different sections as you please. When writing, you can see all your notes at once, so you don't have to stress about forgetting things. It's a very refreshing, intuitive way approach that's worth a try for all disorganized authors. FocusWriter ✍️