edge-pydb 1.2.0

Python based database for CARMA EDGE

edge_pydb

Python-based database for CARMA EDGE. This package requires Python 3.

The EDGE database has several components (see index_csv.md and index_hdf.txt for details):

• Zero-dimensional CSV tables (one value per galaxy), found in dat_glob.

• One-dimensional CSV tables (e.g. radial profiles or spectra), found in dat_prof and dat_spec.

• Downsampled 2D or 3D images, saved as HDF5 binary tables in the img_ directories.

Installation

Install the package directly from PyPI (https://pypi.org/project/edge-pydb/) using

pip install --user edge_pydb

or, if you prefer to keep the latest source code handy, by cloning this Github repository and running

pip install --user .

in the directory containing setup.py.

The --user flag ensures the package is not installed in your system-wide Python directories, which you probably don't have write access to. The package tries to save and update a configuration file _config.json, so installation in your user area is recommended.

If you have access to the protected archive (not on Github), you should also obtain the team_files.py script from Tony which will download and install the additional tables into the appropriate locations. You can run this script in a shell or iPython environment (but should avoid doing so in the same directory as setup.py). Currently the Github repository only includes HDF5 files for one galaxy, for demonstration and testing purposes.

A demo_notebk folder provides examples of accessing database values from a Jupyter notebook.

Basic Usage

from edge_pydb import EdgeTable

EdgeTable('list')

• makes a listing of the available files

ctrpos = EdgeTable('edge_coflux_smo7.csv')

• loads a CSV file. ctrpos can now be treated like an astropy table.

ctrpos = EdgeTable('edge_coflux_smo7.csv', cols=['Name', 'coRactr_smo7', 'coDectr_smo7'])

• loads the three specified columns only from the CSV file

leda = EdgeTable('edge_leda.csv', cols=['Name', 'ledaD25', 'ledaPA', 'ledaIncl'])
ctrpos.join(leda)

• will merge a sub-table from edge_leda.csv into ctrpos. We must select the Name column for the join to work.

comom = EdgeTable('NGC4047.comom_smo7.hdf5', path='smo')

• loads an HDF5 file. The path must be given, otherwise a listing of available paths is provided.

Team Usage

For additional database files not in this Github repository, it’s better to keep these in a separate, more visible directory in your file system, and not inside your Python libraries (site-packages area). Here is the suggested way to do this:

• Leave the git directory in which this README is located. Open an iPython shell and type:

import edge_pydb.util as edgeutil

edgeutil.listfiles(values=True)

• should show only the public data. Now suppose the additional data files are in a folder called pybase.

edgeutil.add_from_dir('/path/to/pybase/', copy=False)

• will add these to your environment. This only needs to be done once after package installation.