[personal kdb+] how to connect to Kdb+ from Matlab

Community Support
,
1

Hi,
When trying to connect to a 32bit KDB+ database (q v2.6) using the
Matlab’s KX Datafeed(V3.5 (R2010a)). I keep getting the following
error:

>> q=kx(‘127.0.0.1’,5001)
??? Undefined function or method ‘c’ for input arguments of type
‘char’.

Error in ==> C:\Program Files\MATLAB\R2010a\toolbox\datafeed\datafeed
@kx\kx.p>kx
at 51

I have looked at “Interfacing with Kdb+ from Matlab”(https://
code.kx.com/trac/wiki/Cookbook/IntegratingWithMatlab) and Matlab’s
solution ID:1-6WOC9E (http://www.mathworks.com/support/solutions/en/
data/1-6WOC9E/index.html?product=DF&solution=1-6WOC9E) . I have
confirmed that

  1. a kdb+ process running on the local host on port 5001;
  2. the jdbc.jar from kx (https://code.kx.com/trac/browser/kx/kdb%2B/c/
    jdbc.jar) is installed and the jar file is added to the classpath
    used by Matlab.

any idea? thx.

–
Submitted via Google Groups

2

there’s a conflict of namespaces

pls try this revision of jdbc.jar

https://code.kx.com/trac/browser/kx/kdb%2B/c/jdbc.jar?rev=377

3

thanks, this revision of jdbc.jar works fine.On 5?4?, ??11?48?, Charles Skelton <char…> wrote:> there’s a conflict of namespaces>> pls try this revision of jdbc.jar>> https://code.kx.com/trac/browser/kx/kdb%2B/c/jdbc.jar?rev=377&gt;&gt;&gt;&gt;&gt;&gt; On Tue, May 4, 2010 at 4:49 AM, Richard Zwz <drzwz…> wrote:> > Hi,> > When trying to connect to a 32bit KDB+ database (q v2.6) using the> > Matlab’s KX Datafeed(V3.5 (R2010a)). I keep getting the following> > error:>> > >> q=kx(‘127.0.0.1’,5001)> > ??? Undefined function or method ‘c’ for input arguments of type> > ‘char’.>> > Error in ==> C:\Program Files\MATLAB\R2010a\toolbox\datafeed\datafeed> > @kx\kx.p>kx> > at 51>> > I have looked at “Interfacing with Kdb+ from Matlab”(https://> > code.kx.com/trac/wiki/Cookbook/IntegratingWithMatlab) and Matlab’s> > solution ID:1-6WOC9E (http://www.mathworks.com/support/solutions/en/&gt; > data/1-6WOC9E/index.html?product=DF&solution=1-6WOC9E) . I have> > confirmed that> > 1) a kdb+ process running on the local host on port 5001;> > 2) the jdbc.jar from kx (https://code.kx.com/trac/browser/kx/kdb%2B/c/&gt; > jdbc.jar) is installed and the jar file is added to the classpath> > used by Matlab.>> > any idea? thx.>> > –> >

Submitted via Google Groups</drzwz…></char…>

4

Hi , I am trying the latest jdbc.jar , but getting error: “The class kx has no Constant property or Static method named ‘c’.”, executinh command line: k = kx(‘127.0.0.1’,5002). Amy help would be much appreciated. Thanks !

5

pls try this revision of jdbc.jar

https://code.kx.com/trac/browser/kx/kdb%2B/c/jdbc.jar?rev=377

and let us know if you continue to have a problem.

thanks