Convert ufloat objects in constructor.

[riga]

When the Number constructor receives an object created with uncertainties.ufloat, its nominal value and uncertainties are extracted and stored properly in the created instance. Error components of the converted ufloat with the same name are assumed to be correlated.

from uncertainties import ufloat
from scinum import Number

# define a ufloat with 2 errors
u = ufloat(1., 0.5, tag="foo") + ufloat(0., 0.25, tag="bar")

# convert to number
n = Number(u)
print(n)
# -> "1.0 +- 0.5 (foo) +- 0.25 (bar)"

See

scinum/tests/__init__.py

Line 96 in 4e3b117

def test_constructor_ufloat(self):

for more examples.

Closes #6.