[yt-users] Light Cone Projection

[Britton Smith]

Hi Pengfei,

The near_redshift and far_redshift are free parameters for you to set, and
just control the redshift interval over which to make the light cone
projection.  You might also want to look at the narrative documentation on
the light cone generator, which you can find here:
http://yt-project.org/doc/analysis_modules/light_cone_generator.html
Note, that you need to use this with a simulation that made enough data
outputs to connect the redshift interval you specify.  The
"enzo_tiny_cosmology" dataset available at http://yt-project.org/data/ was
configured to work with the light cone recipe in the cookbook, so I would
suggest downloading that.

As for the error, this is happening because there is a line in your enzo
parameter file that contains more than one "=" sign.  I have just submitted
a pull request that fixes it, so this should be fixed soon.  In the mean
time, you can simply comment out that line in your parameter file and
everything should work fine.

Britton


On Fri, Sep 6, 2013 at 3:02 AM, Pengfei Chen <madcpf at gmail.com> wrote:

> Hi all,
>
> I downloaded the example script of light cone projectoin(
> http://yt-project.org/doc/cookbook/cosmological_analysis.html#light-cone-projection)
> to my laptop and changed the Enzo simulation parameter file and redshifts.
> But when I ran it the following error occurred:
>
>   File "light_cone_projection.py", line 19, in <module>
>     find_outputs=False)
>   File
> "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/analysis_modules/cosmological_observation/light_cone/light_cone.py",
> line 158, in __init__
>     find_outputs=find_outputs)
>   File
> "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/analysis_modules/cosmological_observation/cosmology_splice.py",
> line 44, in __init__
>     find_outputs=find_outputs)
>   File "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/convenience.py", line
> 131, in simulation
>     find_outputs=find_outputs)
>   File
> "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/frontends/enzo/simulation_handling.py",
> line 81, in __init__
>     find_outputs=find_outputs)
>   File
> "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/data_objects/time_series.py",
> line 343, in __init__
>     self._parse_parameter_file()
>   File
> "/Users/madcpf/Documents/dev_yt/src/yt-hg/yt/frontends/enzo/simulation_handling.py",
> line 273, in _parse_parameter_file
>     param, vals = (i.strip() for i in line.split("="))
> ValueError: need more than 1 value to unpack
>
> Does the parameters "near_redshift" and "far_redshift" in LightCone need
> to be the same with "CosmologyFinalRedshift" and "CosmologyInitialRedshift"
> in enzo parameter file?
> Does anyone know how to solve this?
>
> Thank you all!
>
> Pengfei
>
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