Re: [yt-users] Code units have not been defined in Flash dataset

I should say that as a workaround you can do something like: left_edge = ds.arr([-500, -500,- 20], 'pc') right_edge = ds.arr([500, 500, 20], 'pc') b = ds.box(left_edge, right_edge) I'm already planning to release yt 3.3.4 soon, I'll try to make sure that this fix is part of that release. Thanks again for the bug report! -Nathan On Fri, Jan 27, 2017 at 3:50 PM, Nathan Goldbaum wrote:

Hi Alex,

Thanks for the report! I was able to reproduce the issue and I think I have a fix:

https://bitbucket.org/yt_analysis/yt/pull-requests/2508

If you could give that a test that would be great. No worries if you're not sure how to do that, just wanted an extra bit of confirmation :)

-Nathan

On Fri, Jan 27, 2017 at 3:32 PM, Alex Hill wrote:

...

Hi,

I’ve encountered a new error when specifying a box using units other than code units. This is a Flash 4 plot file in cgs units.

Example:

import yt yt.__version__

‘3.3.3’

d = yt.load('sn34_smd75_sub1_hdf5_plt_cnt_0030') b = d.box([-500,-500,-20]*yt.units.pc.in_cgs(),[500,500,20]*yt. units.pc.in_cgs()) fp = yt.PhasePlot(b,'n','pk',['cell_volume'],weight_field=None, fractional=True)

I get the following error:

UnitParseError: Code units have not been defined. Try creating the array or quantity using ds.arr or ds.quan instead.

If I instead do

b = d.box([-1.54e+21, -1.54e+21, -6.17e+19], [1.54e+21, 1.54e+21, 6.17e+19])

or

left = d.domain_left_edge right = d.domain_right_edge left[2] = -6.17e19 right[2] = 6.17e19 b = d.box(left, right)

I do not get any error. If I specify yt.units.cm, I do get the error.

This was not an issue on the same data file a few months ago. I think I have updated yt in the meantime, but I’m not sure what the version was.

Is this a bug, or am I doing something wrong?

Here is the unit registry for my data set:

reg = d.unit_registry

for un in reg.keys(): if un.startswith('code_'): fmt_tup = (un, reg.lut[un][0], str(reg.lut[un][1])) print ("Unit name: {:<15}\nCGS conversion: {:<15}\nDimensions: {:<15}\n".format(*fmt_tup))

Unit name: code_magnetic CGS conversion: 1.0 Dimensions: sqrt((mass))/(sqrt((length))*(time))

Unit name: code_time CGS conversion: 1.0 Dimensions: (time)

Unit name: code_temperature CGS conversion: 1.0 Dimensions: (temperature)

Unit name: code_pressure CGS conversion: 1.0 Dimensions: (mass)/((length)*(time)**2)

Unit name: code_mass CGS conversion: 1.0 Dimensions: (mass)

Unit name: code_velocity CGS conversion: 1.0 Dimensions: (length)/(time)

Unit name: code_length CGS conversion: 1.0 Dimensions: (length)

Unit name: code_density CGS conversion: 1.0 Dimensions: (mass)/(length)**3

Unit name: code_metallicity CGS conversion: 1.0 Dimensions: 1

Cheers, Alex _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org