KX Community

pressjonny0

HelloAquaQ are going to have a second short series of kdb+ focussed webinars (free of charge), including a guest talk from Nick Psaris on his new book (Fun Q) and a guest panelist in Glenn Wright from Kx. The details of the talks are below, if you wo...

pressjonny0

Hi AllA month or so ago we put out a blog post on Superbowl data visualisation which we got a lot of good feedback from. So we decided to do one on the 6 Nations, and we collected over 10m data points into kdb+ and added some visualisation. The blog ...

pressjonny0

This should work:q)update val_sums:sums val by sums differ val<0 from t sym val val_sums------------------A 500 500 A 1000 1500 A 1500 3000 A -1000 -1000 A -1500 -2500 A 500 500

pressjonny0

That’s great!  That would’ve helped us a while back… 

pressjonny0

We’ve used robocopy in place of move on windows before (windows is pretty painful)Are you sure it is definitely failing? If I remember correctly robocopy would return an ‘os error when invoked from kdb+ but would do what we had asked it to do success...

pressjonny0

Also, lj is doing a bit more work here to give the correct output. .my.lj is dependent on the order of t and u being the same, really the lj equivalent update should be something like:update foo:(5000 5050!`e1`e2)id,bar:(5000 5050!`f1`f2)id,foobar:(5...

pressjonny0

I wouldn’t rely on the default console output to see structure, e.g. q)1 1q)enlist 1 ,1q)enlist enlist 1 1Use 0N! to see structure:q)0N!(5 3 3)#1; ((1 1 1;1 1 1;1 1 1);(1 1 1;1 1 1;1 1 1);(1 1 1;1 1 1;1 1 1);(1 1 1;1 1 1;1 1 1);(1 1 1;1 1 1;1 1 1))

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AquaQuarantine Tech Talks Round 2

Six Nations Rugby

Re: How to reset sums based on criteria

Re: Windows system move vs robocopy

Re: Windows system move vs robocopy

Re: improving native lj performance

Re: Higher-order arrays in q.