Hi yt user,
I start to use yt-3.x version for the gadget analyses.
Although I have previously used the yt-2.6x version for the enzo
analyses, I find that there are many differences between two.
[Now, I find that new yt is significantly improved than previous one
but I need some adjustment..]
Here, I have a question regarding to derived field.
Since, my gadegt outputs only have InterenalEnergy, I need to make a
derived field for temperature as follow:
==============
@derived_field(name=("gas","temperature"), units="K")
def _temperature(field, data):
BOLTZMANN = 1.3806e-16
PROTONMASS = 1.6726e-24
GAMMA = 5.0 / 3.0
H_MASSFRAC = 0.76
mu = 4.0 / (3.0 * H_MASSFRAC + 1.0 + 4.0 * H_MASSFRAC *
data["gas","ElectronAbundance"])
return data["gas","InternalEnergy"]*(GAMMA-1)*mu*PROTONMASS/BOLTZMANN
================
and try to make phase diagram and got the following error message:
.....
yt : [INFO ] 2015-01-04 19:56:35,791 Max Value is 4.03205e-21 at
30150.5327224731445312 31066.5464401245117188 29380.5456161499023438
Traceback (most recent call last):
File "phase.py", line 32, in <module>
weight_field=None)
File "/Users/jhchoi/common/src/yt/yt/visualization/profile_plotter.py",
line 699, in __init__
fractional=fractional)
File "/Users/jhchoi/common/src/yt/yt/data_objects/profiles.py", line
1331, in create_profile
for f, l in zip(bin_fields, logs)]
File "/Users/jhchoi/common/src/yt/yt/data_objects/derived_quantities.py",
line 482, in __call__
rv = super(Extrema, self).__call__(fields, non_zero)
File "/Users/jhchoi/common/src/yt/yt/data_objects/derived_quantities.py",
line 56, in __call__
sto.result = self.process_chunk(ds, *args, **kwargs)
File "/Users/jhchoi/common/src/yt/yt/data_objects/derived_quantities.py",
line 490, in process_chunk
fd = data[field]
File "/Users/jhchoi/common/src/yt/yt/data_objects/data_containers.py",
line 240, in __getitem__
self.get_data(f)
File "/Users/jhchoi/common/src/yt/yt/data_objects/data_containers.py",
line 661, in get_data
self._generate_fields(fields_to_generate)
File "/Users/jhchoi/common/src/yt/yt/data_objects/data_containers.py",
line 687, in _generate_fields
fd.convert_to_units(fi.units)
File "/Users/jhchoi/common/src/yt/yt/units/yt_array.py", line 416,
in convert_to_units
new_units = self._unit_repr_check_same(units)
File "/Users/jhchoi/common/src/yt/yt/units/yt_array.py", line 402,
in _unit_repr_check_same
self.units, self.units.dimensions, units, units.dimensions)
yt.utilities.exceptions.YTUnitConversionError: Unit dimensionalities
do not match. Tried to convert between dimensionless (dim 1) and K
(dim (temperature)).
It looks that new yt become a bit picky on the units.
In this derived field, the unit contribution from BOLTZMANN and
PROTONMASS is not recognized and it causes error, I think.
How can I resolve this error?
Moreover, how can I make derived field without sensitive unit matching?
Sometimes, I used derived field when I need to convert log units for
visualization, and when dealing with the dimensionless field.
Thank you for help,
Junhwan
