def test_scale_effectively_unity():
"""Scale just off unity at machine precision level is OK.
Ensures #748 does not recur
"""
a = (3. * u.N).cgs
assert is_effectively_unity(a.unit.scale)
assert len(a.__repr__().split()) == 3
def to_string(cls, unit):
# Remove units that aren't known to the format
unit = utils.decompose_to_known_units(unit, cls._get_unit_name)
if isinstance(unit, core.CompositeUnit):
if(unit.physical_type == 'dimensionless' and
is_effectively_unity(unit.scale*100.)):
return '%'
if unit.scale == 1:
s = ''
else:
m, e = utils.split_mantissa_exponent(unit.scale)
parts = []
if m not in ('', '1'):
parts.append(m)
if e:
if not e.startswith('-'):
e = "+" + e
parts.append('10{0}'.format(e))
s = 'x'.join(parts)
pairs = list(zip(unit.bases, unit.powers))
if len(pairs) > 0:
pairs.sort(key=operator.itemgetter(1), reverse=True)
s += cls._format_unit_list(pairs)
elif isinstance(unit, core.NamedUnit):
s = cls._get_unit_name(unit)
return s
def to_string(cls, unit):
# Remove units that aren't known to the format
unit = utils.decompose_to_known_units(unit, cls._get_unit_name)
if isinstance(unit, core.CompositeUnit):
if (unit.physical_type == 'dimensionless'
and is_effectively_unity(unit.scale * 100.)):
return '%'
if unit.scale == 1:
s = ''
else:
m, e = utils.split_mantissa_exponent(unit.scale)
parts = []
if m not in ('', '1'):
parts.append(m)
if e:
if not e.startswith('-'):
e = "+" + e
parts.append(f'10{e}')
s = 'x'.join(parts)
pairs = list(zip(unit.bases, unit.powers))
if len(pairs) > 0:
pairs.sort(key=operator.itemgetter(1), reverse=True)
s += cls._format_unit_list(pairs)
elif isinstance(unit, core.NamedUnit):
s = cls._get_unit_name(unit)
return s
def test_scale_effectively_unity():
"""Scale just off unity at machine precision level is OK.
Ensures #748 does not recur
"""
a = (3. * u.N).cgs
assert is_effectively_unity(a.unit.scale)
assert len(a.__repr__().split()) == 3
