MATLAB: Problems retreiving realtime data V3 bloomberg

bloombergdatafeedDatafeed Toolbox

i am running real time data retreival via bloomberg v3 like this

>> [subs,t] = realtime(c,{'IBM US Equity','F US Equity'}), {'Last_Trade','Volume'},'v3stockticker') Error using blp/realtime (line 32) Not enough input arguments.

I do not understand the error in line 32. The corresponding line is posted below:

if ischar(f)

Best Answer

There is an additional bracket in your line of code

 [subs,t] = realtime(c,{'IBM US Equity','F US Equity'}), ...
        {'Last_Trade','Volume'},'v3stockticker')

Note the close bracket after {'IBM US Equity','F US Equity'} which means that the realtime function inputs are limited to just c and {'IBM US Equity','F US Equity'}

 [subs,t] = realtime(c,{'IBM US Equity','F US Equity'})

and the last two inputs are ignored..which means that not enough inputs are supplied and so the error message makes sense.

Just remove that unneeded bracket, replacing your line of code with

 [subs,t] = realtime(c,{'IBM US Equity','F US Equity'}, ...
        {'Last_Trade','Volume'},'v3stockticker')

Try the above and see what happens!

Related Solutions

MATLAB: How to use the “blp.realtime” function to retrieve BID, ASK and LAST_PRICE data using the “v3stockticker” event handler in Datafeed Toolbox R2014a

The "realtime" method of the "blp" class sets up a timer to listen to incoming data from the Bloomberg server. Every time an event, such as a trade, occurs the event handler specified as the 4th input argument to "realtime" is executed. The event handler is the function in charge of processing the incoming data. The "v3stockticker" event handler is an example event handler. It was written to show how to display LAST_TRADE and VOLUME information in the Command Window. It is the responsibility of the user to write his or her own event handler in order to process the correct data.

For example, if you wanted to display the BID, ASK and LAST_PRICE fields in the Command Window in a similar fashion as "v3stockticker" does, you could use the attached exampleEventHandler.m file.

Note that you are not restricted to displaying the data in the Command Window. For example, the "v3pricevol" event handler is an example that illustrates how to display, and continuously update, incoming trades on a chart:

>> [subs,t] = realtime(c,'IBM US Equity',{'Last_Price','Volume'},'v3pricevol')

MATLAB: How to get data from new stocks with an existing Bloomberg connection

To do this, you can make use of the underlying Bloomberg API. This looks like the following:

% Initial setup
b= blp;
fields = {'Last_Trade','Volume'} 
fStock = {'IBM US Equity'}
[subs,t] = realtime(b,fStock,fields); 
newStocks = {'MSFT US Equity';'AAPL US Equity'};
% Import some of the API libraries into the script
import com.bloomberglp.blpapi.*;
% Create a string representation of all of the fields we are requesting
% This is needed later when we add new tickers
fieldsChar = strjoin(fields,',');
% Unsubscribe our connection without completely closing it/
% re-requesting data
b.session.unsubscribe(subs)
% Using the blpapi, add each of the new tickers as subscriptions to
% the original subscription.
% Makes use of the Subscription object, which only takes a single
% string as input, thus requiring the for loop
% Note the different format than the input to the realtime method
for nt = 1:numel(newStocks)
subs.add(Subscription(newStocks{nt},fieldsChar,'',CorrelationID(newStocks{nt})));
end
% Resubscribe, now that the new tickers have been added
b.session.subscribe(subs)

Best Answer

Related Solutions

MATLAB: How to use the “blp.realtime” function to retrieve BID, ASK and LAST_PRICE data using the “v3stockticker” event handler in Datafeed Toolbox R2014a

MATLAB: How to get data from new stocks with an existing Bloomberg connection

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