LCL unpacked representation

[jrleeman]

Interesting behavior found when making a MetPy Monday. Unpacking the LCL values then printing them throws an error (but prints) while LFC does not.

from datetime import datetime
from siphon.simplewebservice.wyoming import WyomingUpperAir

df = WyomingUpperAir.request_data(datetime(2012, 4, 14, 12), 'OUN')

from metpy.units import units
p = df['pressure'].values * units(df.units['pressure'])
T = df['temperature'].values * units(df.units['temperature'])
Td = df['dewpoint'].values * units(df.units['dewpoint'])

import metpy.calc as mpcalc

lfc_pressure, lfc_temperature = mpcalc.lfc(p, T, Td)
lcl_pressure, lcl_temperature = mpcalc.lcl(p[0], T[0], Td[0])

lfc_pressure

907.416511244143 hectopascal

lcl_pressure

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
~/miniconda3/envs/metpydev/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj)
    343             method = get_real_method(obj, self.print_method)
    344             if method is not None:
--> 345                 return method()
    346             return None
    347         else:

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/quantity.py in _repr_html_(self)
    213     # IPython related code
    214     def _repr_html_(self):
--> 215         return self.__format__('H')
    216 
    217     def _repr_latex_(self):

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/quantity.py in __format__(self, spec)
    177                 # this is required to have the magnitude and unit in the same line
    178                 allf = r'\[{0} {1}\]'
--> 179                 parts = ndarray_to_latex_parts(obj.magnitude, mspec)
    180 
    181                 if len(parts) > 1:

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/formatting.py in ndarray_to_latex_parts(ndarr, fmtfun, dim)
    304                 ret += [header % elno + ' = ' + matrix_to_latex(el, fmtfun)]
    305         else:
--> 306             for elno, el in enumerate(ndarr):
    307                 ret += ndarray_to_latex_parts(el, fmtfun, dim + (elno, ))
    308 

TypeError: iteration over a 0-d array

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
~/miniconda3/envs/metpydev/lib/python3.6/site-packages/IPython/core/formatters.py in __call__(self, obj)
    343             method = get_real_method(obj, self.print_method)
    344             if method is not None:
--> 345                 return method()
    346             return None
    347         else:

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/quantity.py in _repr_latex_(self)
    216 
    217     def _repr_latex_(self):
--> 218         return "$" + self.__format__('L') + "$"
    219 
    220     @property

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/quantity.py in __format__(self, spec)
    173         if isinstance(self.magnitude, ndarray):
    174             if 'L' in spec:
--> 175                 mstr = ndarray_to_latex(obj.magnitude, mspec)
    176             elif 'H' in spec:
    177                 # this is required to have the magnitude and unit in the same line

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/formatting.py in ndarray_to_latex(ndarr, fmtfun, dim)
    311 
    312 def ndarray_to_latex(ndarr, fmtfun=lambda x: format(x, '.2f'), dim=()):
--> 313         return '\n'.join(ndarray_to_latex_parts(ndarr, fmtfun, dim))

~/miniconda3/envs/metpydev/lib/python3.6/site-packages/pint/formatting.py in ndarray_to_latex_parts(ndarr, fmtfun, dim)
    304                 ret += [header % elno + ' = ' + matrix_to_latex(el, fmtfun)]
    305         else:
--> 306             for elno, el in enumerate(ndarr):
    307                 ret += ndarray_to_latex_parts(el, fmtfun, dim + (elno, ))
    308 

TypeError: iteration over a 0-d array

Out[27]:
<Quantity(929.7098864382868, 'hectopascal')>