I tried to open up connection with iqfeed but it has problems:

Can somebody help?

>> Q=iqf(4xxxx,6xxxx)
Warning: Out of range or non-integer values truncated during conversion to character.
> In iqf.iqf>iqf.iqf at 44
Warning: Out of range or non-integer values truncated during conversion to character.
> In iqf.iqf>iqf.iqf at 44

Q =

iqf with properties:

User: 4xxxx
Password: 6xxxxxx
Port: {[1x1 System.Net.Sockets.Socket]}
PortName: {'Admin'}

SSQ10

Is this the first time you have setup the software and connection?

We do recomend you contact MATHLAB support for additional support,
The will assist you with the software and connection.

.
Edited by mongfa on Jul 27, 2014 at 12:44 PM

In case anyone stumbles on a similar error, I believe that it was caused because the Matlab iqf function (part of the Trading Toolbox) expects the username and password in string format, i.e. iqf('1234','9876') and not iqf(1234,9876).

Instead of using the Trading Toolbox to connect Matlab to IQFeed, consider using the IQML connector. IQML was optimized for run-time performance (speed), ease-of-use, and reliability. It comes with extensive documentation, and supports the entire IQFeed API. IQML works with the core Matlab; no toolbox is required. It works on all Matlab releases since R2008a, on both Windows and Mac, using IQFeed 5.0 or newer. IQML was developed independently as a commercial 3rd-party product; it is not affiliated with MathWorks or DTN. The connector is actively maintained and supported.

Main features:

• both blocking (snapshot) and non-blocking (streaming) data queries
• parallelized requests for super-fast data query responses
• live Level 1 top-of-book market data (quotes and trades)
• live Level 2 market-depth data
• historical and intraday market data (individual ticks or interval bars)
• fundamental info on assets
• options and futures chains lookup (with market data, Greeks)
• symbols and market codes lookup
• news headlines, story-counts, and complete news stories, with user-specified filters
• user-defined Matlab callback functions to IQFeed messages and market triggers
• user-defined alerts on streaming market events (news/quotes/interval-bar/regional triggers)
• connection stats (continuous update)
• programmatic connect/disconnect

https://UndocumentedMatlab.com/IQML

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Note: I am not a DTN employee; my post reflects my personal opinion and not necessarily DTN's

- Yair
IQML - IQFeed-Matlab connector
https://UndocumentedMatlab.com/IQML