KX Community

SJT

A challenge for the weekend? Something from the Vector Dōjō… A single-expression function to replace multiple embedded spaces in a string with single spaces. E.g. q)rmeb "the quick brown fox" "the quick brown fox" If you find yourself writing a loop,...

SJT

Last few puzzles still to write up for AOC 2022, but it’s time to Return to the Vector Dojo. The Vector Dojo is a free, informal 90-minute video call to practice vector-programming techniques together. It’s easy to get started in q using expressions ...

SJT

Q derives from the mathematical notation Ken Iverson developed at Harvard. Years before, when Ken was a young man in Alberta, a farmer he worked for asked him if he knew how to use a certain tool. Ken didn’t. “Well,” said the farmer, “you won’t learn...

SJT

In the latest episode of the Array Cast podcast we interview KX’s CEO, Ashok Reddy. On this episode we speak to Ashok about his experience in software development and the roles that KX, q and time-series computing will play in the future.

SJT

The qbists review of Advent of Code 2022 solutions has reached Day 17, which includes a simple console animation. (Below.) In the latest episode of the Array Cast podcast we discuss the relevance of recreational programming. It has a special importan...

SJT

Thanks for catching a blatant error! I can see the error and the fix but I am more interested in what would allow you to do the same. I'm on a bike tour right now, camping and visiting friends and family. Here's my bike, the Invincible Summer, at San...

SJT

dc: .Q.a -1+ "j"$ sqrt %[;3] -[;8] :: / decrypt dc 371 56 20 251 1091 35 683 683 440 A sequence of unaries is close to an ideal style in q. According to Arthur Whitney, Ken Iverson considered even infix notation as a sequence of unaries, e.g. 2*3+4 a...

SJT

Nicely timed question! I’m just up to the chapter on composition in the book I’m writing, Vector Programming in Q, and I need to settle a few questions about it myself. For example, is there ever a reason to prefer Compose to a train suffixed by @ or...

SJT

q)list1:4 7 9 7 2 8 9 q)ru:@[;1] desc distinct:: /runner-up q)ru list1 8 Using general list notation (items separated by semicolons and embraced by parentheses) suggests a list is general; better to write a vector as a vector literal. Composition ru ...

SJT

A surprise? Char is a sortable type and Less Than is as fast as Equals and faster than Not Equals. q)\ts:100000 "quick brown fox">" " 13 752 q)\ts:100000 "quick brown fox"<>" " 27 880 q)\ts:100000 "quick brown fox"=" " 13 752 q)\ts:100000 not"quick b...

KX Community

User Statistics

User Activity

Something for the weekend?

Return to the Vector Dojo

My guitar homework

Ashok Reddy on the Array Cast

AOC 2022; the new ArrayCast episode – and Ashok on next!

Re: Finding primes with q

Re: Challenge 5 - Crack the Code

Re: Challenge 3 – The Runner-Up

Re: Challenge 3 – The Runner-Up

Re: Something for the weekend?