Awesome Q
Awesome Q is a community-curated list of useful or interesting libraries for using kdb+, modelled on similar collections for other languages (e.g. Rust, Go, PHP, Python). http://awesome-q.org
Forum Posts
QR: Quick Response quite reasonable; quirkily rectangular
Turning a URL into a QR (Quick Response) code is an illuminating exercise. Following the description of the algorithm posted by Vidurangi Kalpana, and setting aside the business of representing a boolean matrix in print or on a screen, the steps are:...
Flouring the loaf
Now here’s a task that cries out for a simple solution: put a border round a matrix. My matrix is boolean and represents a QR code (yes, we’ll come to that) but it’s the same problem as, say, putting a 1px border on an image. So let’s examine it as w...
sym flipping back and forth when creating continues futures contacts based on volume
I am trying to create a continues futures contacts based on volume. But the problem I am facing is the symbols are flipping back and forth. How did you fixed the sym being flipping back and forth?posted my query on stackoverflow, but no luck with sol...
how to find the first element for each row which satisfy the condition
suppose i have a table t: ([]isMatched: (1b,1b,0b,0b;1b,1b,0b,0b;0b,0b,1b,1b); index:((0,1,2,3);(0,1,2,3);(0,1,2,3));id: ((`a,`b,`c,`d);(`a,`b,`c,`d);(`a,`b,`c,`d))) so each row will find use the first element in idx which the corresponding element i...
