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11.4.7. astroML.datasets.fetch_sdss_galaxy_colors

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

Loader for SDSS galaxy colors.

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

Parameters :

data_home : optional, 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_missing : optional, 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 :

data : recarray, shape = (10000,)

record array containing magnitudes and redshift for each galaxy