.j.j domain error

Community Support
1

Something very odd - I get an error 'domain for anything i pass to .j.j. 

KDB+ 3.5 2017.04.10 Copyright (C) 1993-2017 Kx Systems

w32/ 4()core 4095MB <name> hunter 192.168.1.154 NONEXPIRE

Welcome to kdb+ 32bit edition

For support please see http://groups.google.com/d/forum/personal-kdbplus

Tutorials can be found at http://code.kx.com/wiki/Tutorials

To exit, type \

To remove this startup msg, edit q.q

q).j.j

![-31]

q).j.j 12

'domain

  [0]  .j.j 12

       ^

q).j.j “foo”

'domain

  [0]  .j.j “foo”

I don’t use this machine for my kdb coding often and am pretty sure this was working last time I worked on this machine for coding (about six months ago).

Has anyone run into this and have suggestions? Am lost …

2

sounds like you have a more recent q.k being found which does not match the q binary you are using.

the underlying 31! which .j.j used, changed signature in v3.6 2018.12.06.

3

to be more precise, v3.5’s json serializer, .j.j, is written in k.

In v3.6, it is native/built-in, ~40x faster, using -31!.

The release of v3.5 which you are using does not check that the correct q.k is being used for that binary, and if you happened to be using a q.k from v3.6 with v3.5, you’d observe 'domain error for your scenario.

4

That was indeed the problem - thanks!