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# MACD Sample

## About This Sample

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.

## Importing This Sample into StreamBase Studio

In StreamBase Studio, import this sample with the following steps:

- From the top-level menu, click File → Load StreamBase Sample.

- Enter `macd` to narrow the list of options.

- Select Calculate Moving Average Convergence Divergence from the Applications category.

- Click OK.

StreamBase Studio creates a project for the sample.

## Running This Sample in StreamBase Studio

1. In the Project Explorer view, open the sample you just loaded.

   If you see red marks on a project folder, wait a moment for the project to load its features.

   If the red marks do not resolve themselves after a minute, select the project, right-click, and select Maven → Update Project from the context menu.

2. Open the `src/main/eventflow/`packageName`` folder.

3. Open the `MACD.sbapp` file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

4. Select the Feed Simulations view. In that view, select the feed simulation file `MACD.sbfs` and click Run.

5. When done, press F9 or click the Terminate EventFlow Fragment button.

## This Sample's Files

The MACD sample application consists of:

MACD.sbapp

  EventFlow application

MACD.sbfs

  Feed simulation file

MACD.csv

  Feed simulation data file

MACD.xls

  A Microsoft Excel file that you can use in conjunction with the StreamBase Adapter for Microsoft Excel. See the Adapters Guide for more information on this external adapter

## Sample Location

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 permission problems. The default workspace location for this sample is:

    studio-workspace/sample_MACD

See Default Installation Directories for the default location of `studio-workspace` on your system.