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»Forums Index »Product Support »IQFeed 3rd Party Software Support »IQFeed connection not working with Matlab
Author Topic: IQFeed connection not working with Matlab (6 messages, Page 1 of 1)

-Interested User-
Posts: 1
Joined: Aug 24, 2013

Posted: Aug 24, 2013 12:15 PM          Msg. 1 of 6
Trying to get the S&P500 stock components with below logic:


where stocks is a cell array with all 500 components.
put this in a loop, with 4 sec delay, and the history command will stop returning the total amount of days for a specific symbol.

For example:

Symbol: EXPD, Nr.of days collected:665
Symbol: EXPE, Nr.of days collected:665
Symbol: F, Nr.of days collected:1

Symbol: CVS, Nr.of days collected:665
Symbol: CVX, Nr.of days collected:1

Symbol: CBE, Nr.of days collected:665
Symbol: CBG, Nr.of days collected:14

each time the program will reach these particular symbols, the history will stop returning the proper amount of days requested.
The workaround is to close-down Matlab (IQF connection may remain open) and open it again.

Are there any troubleshooting means, any diagnostic commands that could help - for example assess if the connection to IQFeed is still operational ?

I assume I'm not the only one trying to download the components of an index from within matlab - are there any working samples available anywhere?


DTN_Tim Walter
-DTN Guru-
Posts: 1130
Joined: Apr 25, 2006

Posted: Sep 23, 2013 11:14 AM          Msg. 2 of 6
Hello Andrei,

Sorry to have missed this, were you able to get this worked out since this post?


-Interested User-
Posts: 4
Joined: Jul 27, 2014

Posted: Jul 27, 2014 12:44 PM          Msg. 3 of 6
I also have this problem. could you give us sample code or solution?

DTN_Tim Walter
-DTN Guru-
Posts: 1130
Joined: Apr 25, 2006

Posted: Jul 28, 2014 01:28 PM          Msg. 4 of 6
Hello Mongfa,

I am sorry, but I do not have access to MatLab's API documentation so we would recommend going to them for support. All of the samples I would have to illustrate what you are doing require an IQFeed API subscription. But, what I see in the code above appears to make sense, so if you are having the same issue in your loops, I would certainly check with Matlab to see if they have an update or any advice that they could give. If there is a systematic issue with their API interface, I would think this would be a common call for them to receive if so.

Edited by DTN_Tim Walter on Jul 28, 2014 at 01:29 PM

-Interested User-
Posts: 4
Joined: Jul 27, 2014

Posted: Jul 30, 2014 06:25 PM          Msg. 5 of 6
same loops code with another datafeed is working correctly. but it's not work with iqfeed

DTN_Tim Walter
-DTN Guru-
Posts: 1130
Joined: Apr 25, 2006

Posted: Jul 31, 2014 07:39 AM          Msg. 6 of 6
Good morning,

That type of logic works within our API as well, so I do not know what the issue that you are having is. There are features within our API that would allow me to help further, all I can do is hope that MatLab has the same kind of thing within their system to help you get past this.

I am sorry I cannot be of more help here,


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