Schoener's D index calculator for niche overlap.

D_{ij} = 1 - \frac{1}{2} \sum_{k = 1}^{S} \left\lvert P_{ik} - P_{jk} \right\rvert

schoenerd is a CLI program designed to compute the Schoener's D Index for niche overlap between pairs of species[^1] exploiting a common resource.

Installation

Build from source[^2]

The following building instructions compile and install schoenerd from the git master branch. They assume the Rust stable toolchain (or any version >= 1.70.0) installed on the system[^3], as well as the just command runner.

git clone https://github.com/marcoradocchia/schoenerd
cd schoenerd
just build
sudo just install

By default, installation prefix is set to /usr/local. To use a different installation prefix, specify it via the PREFIX environment variable as PREFIX=<prefix> sudo just install, where <prefix> is a placeholder for the desired path.

NOTE: The install recipe in the justfile is Linux-specific and not available on other platforms. In order to install schoenerd on a non-Linux platform, manual installation of the build artifacts (binary, completions, manpage, etc.) is required.

GitHub releases

Pre-compiled binary[^4] of the latest release, as well as shell completion scripts[^5] and manpage are available in GitHub releases.

Cargo

Installing with Rust's cargo package manager is available on any platform (Linux, Windows, macOS, etc.).

NOTE: cargo installs the schoenerd binary in $CARGO_HOME/bin, however it ignores shell completions and manpage. If you need either of those, consider using one of the other installation options.

Master Branch

Build and install with cargo on any platform from git master branch:

cargo install --git https://github.com/marcoradocchia/schoenerd --branch master

crates.io

Build and install with cargo on any platform from latest release:

cargo install schoenerd

Arch User Repository

For Arch Linux users, packages are available in the Arch User Repository:

• schoenerd: builds from source, from latest release;
• schoenerd-bin: pre-compiled binary[^4] of the latest release;
• schoenerd-git: builds from source, from git master branch.

WARNING: schoenerd, schoenerd-bin & schoenerd-git AUR packages are mutually exclusive and conflict with each other.

You may install one of the above packages using an AUR helper, such as yay:

yay -S schoenerd-bin # or `schoenerd`, or `schoenerd-git`

or paru:

paru -S schoenerd-bin # or `schoenerd`, or `schoenerd-git`

Usage

schoenerd accepts input data either from stdin or input file (using the -i/--input option) and produces output either to stdout or output file (using the -o/--output option). This allows schoenerd to be used as a standalone program or inside a UNIX pipeline, which makes it suitable for usage along with other programs or inside scripts.

Input format

Input data must be formatted as a Comma Separated Value table. Take as an example the data table below:

If one wanted to calculate the Schoener's D Index for each pair of pollinators, column headers of the table should contain each pollinator species, while row headers should contain each of the plant species representing the available resources. Each intersection cell must represent a non-negative integer value describing the interaction between each plant/pollinator pair (e.g. number of visits).

schoenerd requires such a table to be serialized in a CSV format, like below:

,Bombus pratorum,Bombus lapidarius,Bombus mesomelas,Bombus pascuorum
Carduus chrysacanthus,1,0,0,0
Carlina acaulis,0,0,0,1
Stachys germanica,134,18,5,14
Trifolium pratense,1,0,1,0
Trifolium repens,6,0,4,0
Oxytropis campestris,53,3,153,0

Output format

By default schoenerd produces CSV formatted output as shown below:

FIRST SPECIES,SECOND SPECIES,D INDEX
Bombus pratorum,Bombus lapidarius,0.8300366300366301
Bombus pratorum,Bombus mesomelas,0.3321378008494573
Bombus pratorum,Bombus pascuorum,0.6871794871794872
Bombus lapidarius,Bombus mesomelas,0.17353198948290982
Bombus lapidarius,Bombus pascuorum,0.8571428571428571
Bombus mesomelas,Bombus pascuorum,0.030674846625766916

Each record (line) of the output data contains three fields described by the CSV headers: first two fields contain the two pollinator species of which the D index is reported in the third field.

Pretty table

Using the -p/--pretty-table flag the output is formatted into a table for quick data visualization. Using the same input above, the produced result is an ASCII version of the following table:

Help

Output of schoenerd -h listed below:

schoenerd v0.1.0 - Marco Radocchia <marco.radocchia@outlook.com>, Gaia Di Francescantonio <gaiadfa@virgilio.it>
Schoener's D index calculator for niche overlap.

Usage:
  schoenerd [OPTIONS]

Options:
  -i, --input <FILE>
          Input CSV file path
  -f, --input-field-delimiter <CHAR>
          Input CSV field delimiter
  -t, --input-record-terminator <CHAR>
          Input CSV record terminator
  -c, --input-quote-character <CHAR>
          Input CSV quote character
  -o, --output <FILE>
          Output CSV file path
  -F, --output-field-delimiter <CHAR>
          Output CSV field delimiter
  -T, --output-record-terminator <CHAR>
          Output CSV record terminator
  -C, --output-quote-character <CHAR>
          Output CSV quote character
  -n, --disable-output-headers
          Disable output headers
  -s, --sort <DIRECTION>
          Sort output by D index value [possible values: descending, ascending]
  -p, --pretty-table
          Display output as a pretty table on stdout
  -h, --help
          Print help (see more with '--help')
  -V, --version
          Print version

License

This project is licensed under GPLv3.

[^1]: Schoener, T.W. (1968) Anolis lizards of Bimini: resource parti tioning in a complex fauna. Ecology, 49, 704–726. [^2]: schoenerd compiles on all platforms (Linux, Windows, macOs, ...) as long as rust and just are correctly installed, however installation recipes in the justfile are currently Linux only. [^3]: Install using rustup. [^4]: Currently x86_64-linux-gnu only. [^5]: Currently zsh, bash & fish.