Hi,
This is due to a backward incompatible change in the way yt handles "extra fields" (particle age, metallicity, ...). The new behavior is to teach yt which field is which at load time. This is documented here http://yt-project.org/doc/examining/loading_data.html#adding-custom-particle-fields but don't hesitate to ask questions If that's not clear.

CC

On 14 May 2019 22:40:18 CEST, Matthew Turk <matthewturk@gmail.com> wrote:
I'm not sure with RAMSES, and that might be a better question for
Corentin, but if we can figure out which field corresponds to the age
we can move on from there.

On Tue, May 14, 2019 at 3:39 PM Vadlamani Samhitha
<vadlamani.samhitha@gmail.com> wrote:

I see. How do I check what units are these fields in since all of them are dimensionless? Is the default code units seconds?

On Tue, 14 May 2019 at 5:40 PM, Matthew Turk <matthewturk@gmail.com> wrote:

Hi,

Do the *values* in the "extra_fields" match? If so, what is likely
happening is the fields are found, but unknown, and we need to specify
the dimensions in the load.

On Tue, May 14, 2019 at 7:38 AM Vadlamani Samhitha
<vadlamani.samhitha@gmail.com> wrote:

Hi,

Following the commit (https://github.com/yt-project/yt/pull/2259), I am unable to access the field 'particle_age' which I was able to do before. The list of fields I currently have for my RAMSES data is:

('all', 'mesh_id')

('all', 'particle_angular_momentum')

('all', 'particle_angular_momentum_magnitude')

('all', 'particle_angular_momentum_x')

('all', 'particle_angular_momentum_y')

('all', 'particle_angular_momentum_z')

('all', 'particle_cylindrical_velocity_theta')

('all', 'particle_cylindrical_velocity_z')

('all', 'particle_extra_field_1')

('all', 'particle_extra_field_2')

('all', 'particle_extra_field_3')

('all', 'particle_extra_field_4')

('all', 'particle_extra_field_5')

('all', 'particle_identity')

('all', 'particle_index')

('all', 'particle_mass')

('all', 'particle_ones')

('all', 'particle_position')

('all', 'particle_position_cylindrical_radius')

('all', 'particle_position_cylindrical_theta')

('all', 'particle_position_cylindrical_z')

('all', 'particle_position_relative')

('all', 'particle_position_relative_x')

('all', 'particle_position_relative_y')

('all', 'particle_position_relative_z')

('all', 'particle_position_spherical_phi')

('all', 'particle_position_spherical_radius')

('all', 'particle_position_spherical_theta')

('all', 'particle_position_x')

('all', 'particle_position_y')

('all', 'particle_position_z')

('all', 'particle_radial_velocity')

('all', 'particle_radius')

('all', 'particle_refinement_level')

('all', 'particle_specific_angular_momentum')

('all', 'particle_specific_angular_momentum_x')

('all', 'particle_specific_angular_momentum_y')

('all', 'particle_specific_angular_momentum_z')

('all', 'particle_spherical_position_phi')

('all', 'particle_spherical_position_radius')

('all', 'particle_spherical_position_theta')

('all', 'particle_spherical_velocity_phi')

('all', 'particle_spherical_velocity_radius')

('all', 'particle_spherical_velocity_theta')

('all', 'particle_velocity')

('all', 'particle_velocity_cylindrical_radius')

('all', 'particle_velocity_cylindrical_theta')

('all', 'particle_velocity_cylindrical_z')

('all', 'particle_velocity_magnitude')

('all', 'particle_velocity_relative')

('all', 'particle_velocity_relative_x')

('all', 'particle_velocity_relative_y')

('all', 'particle_velocity_relative_z')

('all', 'particle_velocity_spherical_phi')

('all', 'particle_velocity_spherical_radius')

('all', 'particle_velocity_spherical_theta')

('all', 'particle_velocity_x')

('all', 'particle_velocity_y')

('all', 'particle_velocity_z')

('all', 'relative_particle_position')

('all', 'relative_particle_position_x')

('all', 'relative_particle_position_y')

('all', 'relative_particle_position_z')

('all', 'relative_particle_velocity')

('all', 'relative_particle_velocity_x')

('all', 'relative_particle_velocity_y')

('all', 'relative_particle_velocity_z')


I tried the 'extra_fields_x' but none of them match with the dimensions of time. Any help is appreciated and thanks.
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