11.4.7. astroML.datasets.fetch_sdss_galaxy_colors

astroML.datasets.fetch_sdss_galaxy_colors(data_home=None, download_if_missing=True)[source]

Loader for SDSS galaxy colors.

This function directly queries the sdss SQL database at http://cas.sdss.org/

Parameters
data_homeoptional, default=None

Specify another download and cache folder for the datasets. By default all scikit learn data is stored in ‘~/astroML_data’ subfolders.

download_if_missingoptional, default=True

If False, raise a IOError if the data is not locally available instead of trying to download the data from the source site.

Returns
datarecarray, shape = (10000,)

record array containing magnitudes and redshift for each galaxy