def sample(data, fraction=0.1):
from booq import utils
if utils.is_number(data):
return sample_rows(data, fraction)
else:
assert utils.is_array(data), "Currently, array objects accepted are numpy's"
return sample_array(data, fraction)
def read(self, columns=None, rows=None, ucds=None, match_ucds='any'):
'''
'''
from booq.utils import is_number
if is_number(rows):
logging.debug("Argument 'rows' is a number.")
from booq.data.utils import sample
rows = sample(self.nrows,fraction=rows)
if ucds:
logging.info("using 'ucds' to define 'columns' to read.")
logging.debug("'ucds' requested: {!s}".format(ucds))
ucdcols = self.colnames_by_ucd(ucds, match=match_ucds)
if ucdcols:
if not columns:
columns = []
columns.extend(ucdcols)
#REVIEW: do not guarantee order of columns after 'set'
columns = list(set(columns))
logging.debug("'columns' to be read: {!s}".format(columns))
data,meta = read_from_handler(self._handler, columns=columns, rows=rows)
return Fits(data,meta,self)