Contents
Moving Average Convergence Divergence (MACD) is a momentum indicator that follows trends and shows the relationship between two moving averages of prices. This sample calculates the MACD by subtracting the 26-day Exponential Moving Average (EMA) from a 12-day EMA. A 9-day EMA of MACD, called the signal, is then computed.
The aggregate function exp_moving_avg emits Null until the
aggregate operator receives enough tuples to compute the first moving average. The
filter operators filter out tuples that contains Null.
The application also includes an Excel spreadsheet that displays the MACD and signal values. The MACD and signal lines are plotted automatically.
The MACD sample application consists of:
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An EventFlow application,
MACD.sbapp. -
A feed simulation file,
MACD.sbfs. -
A feed simulation data file,
MACD.csv. -
A Microsoft Excel file,
MACD.xls, that you can use in conjunction with the StreamBase Adapter for Microsoft Excel. See the Adapters Guide for more information on this external adapter.
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In the Package Explorer, double-click to open the
MACD.sbappapplication. Make sure the application is the currently active tab in the EventFlow Editor. -
Click the
Run button. This opens the SB
Test/Debug perspective and starts the application.
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Select the Feed Simulations view. In that view, select the feed simulation file
MACD.sbfs, and click . -
When done, press F9 or click the
Stop Running Application button.
This section describes how to run the sample in UNIX terminal windows or Windows command prompt windows. On Windows, be sure to use the StreamBase Command Prompt from the Start menu as described in the Test/Debug Guide, not the default command prompt.
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Open three terminal windows on UNIX, or three StreamBase Command Prompts on Windows. In each window, navigate to the directory where the sample is installed, or to your workspace copy of the sample, as described above.
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In window 1, launch StreamBase Server on
MACD.sbapp:sbd MACD.sbapp
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In window 2, enter the following command to dequeue tuples from the sbd output streams:
sbc dequeue OutputAll
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In window 3, run sbfeedsim on the provided configuration file, suppressing the printout of tuples.
sbfeedsim -q MACD.sbfs
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In window 3, type the following command to terminate the server and dequeuer:
sbadmin shutdown
In StreamBase Studio, import this sample with the following steps:
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From the top menu, click → .
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Select this application from the Applications list.
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Click OK.
StreamBase Studio creates a project for each sample.
When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights.
Important
Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.
Using the workspace copy of the sample avoids the permission problems that can occur when trying to work with the initially installed location of the sample. The default workspace location for this sample is:
studio-workspace/sample_MACD
See Default Installation
Directories for the location of studio-workspace on your system.
In the default TIBCO StreamBase installation, this sample's files are initially installed in:
streambase-install-dir/sample/MACD
See Default Installation
Directories for the location of streambase-install-dir on your system. This location
may require administrator privileges for write access, depending on your platform.