Trying to get the S&P500 stock components with below logic:

history(q,char(stocks(n)),{'01/01/2011','08/23/2013'},'Daily');

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?

Thx

Hello Andrei,

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

Tim

I also have this problem. could you give us sample code or solution?

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.

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

same loops code with another datafeed is working correctly. but it's not work with iqfeed

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,
Tim