我正在尝试为 yt 中的一个派生字段添加一个数字下限。但是,当我尝试时: new_field = 1.0e-10 + data['metal_density']
我收到以下错误:
In [1]: ad = ds.all_data()
In [2]: floored_density = 1.0e-10 + ad['density'] yt : [INFO ] 2014-09-26 10:15:21,901 Gathering a field list (this may take a moment.) yt : [INFO ] 2014-09-26 10:15:22,275 Loading field plugins. yt : [INFO ] 2014-09-26 10:15:22,275 Loaded angular_momentum (8 new fields) yt : [INFO ] 2014-09-26 10:15:22,276 Loaded astro (14 new fields) yt : [INFO ] 2014-09-26 10:15:22,276 Loaded cosmology (20 new fields) yt : [INFO ] 2014-09-26 10:15:22,276 Loaded fluid (56 new fields) yt : [INFO ] 2014-09-26 10:15:22,277 Loaded fluid_vector (88 new fields) yt : [INFO ] 2014-09-26 10:15:22,278 Loaded geometric (102 new fields) yt : [INFO ] 2014-09-26 10:15:22,278 Loaded local (102 new fields) yt : [INFO ] 2014-09-26 10:15:22,278 Loaded magnetic_field (108 new fields) yt : [INFO ] 2014-09-26 10:15:22,278 Loaded species (108 new fields)
--------------------------------------------------------------------------- YTUnitOperationError Traceback (most recent call last) /home/skillman/yt-x86_64/src/yt-3.0/yt/mods.pyc in <module>()
----> 1 floored_density = 1.0e-10 + ad['density']
/home/skillman/yt-x86_64/src/yt-3.0/yt/units/yt_array.pyc in
__radd__(self, left_object)
674 def __radd__(self, left_object):
675 """ See __add__. """
--> 676 lo = sanitize_units_add(self, left_object, "addition")
677 return YTArray(super(YTArray, self).__radd__(lo))
678
/home/skillman/yt-x86_64/src/yt-3.0/yt/units/yt_array.pyc in sanitize_units_add(this_object, other_object, op_string)
159 else:
160 if not inp.units.is_dimensionless:
--> 161 raise YTUnitOperationError(op_string, inp.units, dimensionless)
162 return ret
163
YTUnitOperationError: The addition operator for YTArrays with units (g/cm**3) and (1) is not well defined.