def _convert_unit(self, idx, dim=0):
if isinstance(idx, slice):
return self._convert_slice(idx)
if isinstance(idx, basestring):
#TODO: testing on 2D dimensions, negative indices, very small steps
# testing if/when uc should be updated, esp. in states encoding.
number, unit = num_unit(idx)
try: return self.uc[dim].i(number, unit)
except ValueError:
raise ValueError('Incompatible unit %s. Possible units: ppm, ms, hz' %unit)
else:
return idx
def interval(self, step):
step_unit = num_unit(step)[1]
return self._convert_unit(step) - self._convert_unit('0'+step_unit)
