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Maximum size of sym file on kdb+3.5

by araza New Contributor in kdb+ and q
‎2022.10.25 09:35 AM
‎2022.10.25 09:35 AM
Hi there,   Does anyone know what the maximum limit of the sym file size is on kdb+ version 3.5?   Thank you! 
Labels:
  • Labels:
  • kdb+
  • sym files

Why sometimes the amend/index doesn't work?

by vivo in kdb+ and q
‎2022.10.11 07:34 AM
‎2022.10.11 07:34 AM
In below code, a1 doesn't work. Any ideas why?   myObj: (5 7; (`a; `b ; (4 5))); a3:.[myObj; 1 2 1; {count x}]; // i.e. ((5 7);(`a;`b;4 1)) a2:.[myObj; 1 2; {count x}]; // i.e. ((5 7);(`...
Labels:
  • Labels:
  • datatypes

In funtional qSQL, what is the meaning when the op...

by vivo in kdb+ and q
‎2022.10.11 03:55 AM
‎2022.10.11 03:55 AM
In the below code, I can understand the meaning of (<), but cannot understand the meaning of (';~:;<). Why line 3 keeps 4 rows, while line 4 keeps 6 rows? What is the meaning of "~:" here?...
Labels:
  • Labels:
  • operators

BI or KDB+?

by annach in kdb+ and q
‎2022.10.02 06:18 AM
1 Kudo
‎2022.10.02 06:18 AM
1 Kudo
Hello everyone, We are a data centric startup that collects information over various channels on the web, and we aim to help buisnesses to use that info to their advantage in various ways. We are...

select with assignment

by powerpeanuts in kdb+ and q
‎2022.09.15 03:09 AM
‎2022.09.15 03:09 AM
I remember in q, we can assign a temporary variable during select and use it again in the same column, but seems it is not working. For example, select (total+5)%(total:a+b) from t this should ...

Accumulators - Access additional list / column

by RV in kdb+ and q
‎2022.09.05 02:07 AM
‎2022.09.05 02:07 AM
...2 ? c1 prev c2 30 10 10   10>0 (True) OR No need of evaluation ? 10   40 20 20 &n...
Labels:
  • Labels:
  • execution control
  • iterators
  • operators

Each Parallel issue

by k-mambo in kdb+ and q
‎2022.08.29 04:36 AM
‎2022.08.29 04:36 AM
Follows https://code.kx.com/q/basics/peach/, The result of  m':[x]  is exactly the same as  m'[x] . If no secondary tasks are available, performance is the same as well. but m...
Labels:
  • Labels:
  • iterators

rolling linear regression in q

by powerpeanuts in kdb+ and q
‎2022.08.21 09:04 PM
‎2022.08.21 09:04 PM
hi, is there a function to compute rolling linear regression (multiple independent variables) for a q table?   I am looking for something like https://www.statsmodels.org/dev/generated/...

What is the difference between wj and wj1?

by vivo in kdb+ and q
‎2022.08.19 02:28 AM
‎2022.08.19 02:28 AM
I have the below code, in which the result of wj and wj1 are exactly the same. Is there an example that wj and wj1 would give different output? From the documentation I can see that the 2 functi...
Labels:
  • Labels:
  • keywords

Swap key-value in dictionary

by powerpeanuts in kdb+ and q
‎2022.08.18 07:11 PM
‎2022.08.18 07:11 PM
hi, how can I swap key and list of values using q? Thanks! python version: https://stackoverflow.com/questions/51740270/python-dictionary-swap-keyvalue-pair-when-values-exist-in-mutiple-keys ...
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