# Getting Started¶

## Requirements¶

• Matlab with Signal Processing toolbox. Should work on Matlab R2014b or newer.

• The PhysioNet WFDB tools. The toolbox can install this for you.

## Installation¶

2. From matlab, run the mhrv_init function from the root of the repo. This function will:

• Check for the presence of the WFDB tools in your system PATH.

• If WFDB tools are not detected, it will attempt to automatically download them for you into the folder bin/wfdb under the repository root.

• Set up your MATLAB path to include the code from this toolbox.

### Notes about matlab’s pwd and path¶

Matlab maintains a PWD, or “present working directory”. It’s the folder you see at the top of the interface, containing the files you see in the file explorer pane. Type pwd at the matlab command prompt to see it’s value.

Additionally, matlab maintains a PATH variable, containing a list of folders in which it searches for function definitions (similar to the shell PATH concept). Type path at the matlab command prompt to see it’s value.

You don’t need to change your pwd to the root of the repo folder for the toolbox to work. You can simple run the mhrv_init function from your current pwd, and it will take care of updating matlab’s path. For example, if you cloned or downloaded the toolbox in the folder /Users/myname/mhrv/, you can run the following command from the matlab prompt:

run /Users/myname/mhrv/mhrv_init.m


After this the toolbox will be ready to use, regardless of your pwd.

### Manual WFDB Installation (Optional)¶

The above steps should be enough to get most users started. In some cases mhrv_init may fail to download the correct binaries for you, or you may want to install them yourself.

• On macOS, you can use homebrew. First install homebrew, then install wfdb with brew tap brewsci/science && brew install wfdb.

• On any OS (including macOS), you can compile the WFDB binaries from source using the instructions on their website.

Once you have the binaries, place them in some folder on your $PATH or somewhere under the repo’s root folder (bin/wfdb would be a good choice as it’s .gitignored) and they will be found and used automatically. You can replace the binaries that were automatically downloaded with your compiled ones. If you used homebrew, they should already be on your $PATH.

If you would like to manually specify a path outside the repo which contains the WFDB binaries (e.g. /usr/local/bin for a homebrew install), you can edit cfg/defaults.yml and set the mhrv.paths.wfdb_path variable to the desired path.

For macOS users it’s recommended to install with homebrew, and for linux users it’s recommended to install from source, as the binaries provided on the PhysioNet website are very outdated.