python - how do I make a numpy array from a list of pint quantities -

import numpy np pint import unitregistry  unit = unitregistry() q_ = unit.quantity = 1.0*unit.meter b = 2.0*unit.meter # calculations change , b  x=np.array([a.magnitude,b.magnitude])*q_(1.0,a.units) 

will make numpy array variables , b pint quantities. crude there no guarantee , b have same units. there cleaner way it? need write function?

you should convert base unit to_base_units() before creating numpy array it, no need write function this, simple list comprehension nicely.

if you're doing numerically heavy calculations on x want keep in reference unit , use raw array (without attached unit), , limit unit conversions input/output phase of program.

import numpy np pint import unitregistry  unit = unitregistry() q_ = unit.quantity  = 1.0 * unit.meter b = 2.0 * unit.meter c = 39.37 * unit.inch  # list values in different units (meters , inches) measures = [a, b, c]  # use comprehension list magnitudes in base unit x = np.array([measure.to_base_units().magnitude measure in measures])  print x * q_(1.0, unit.meter)  >> [ 1.        2.        0.999998] meter