[yt-users] log-linear phase plot

[Wolfram Schmidt]

Hi everyone,

I defined two fields, say, FieldOne and FieldTwo, to make 2D phase plot.
FieldOne is logarithmic by default, FieldTwo is linear (i.e., I set 
take_log=False in add_field).

I want to produce a phase plot with logarithmic bins for FieldOne and 
linear bins for FieldTwo, where the range of FieldTwo is [-10,10]

I thought that

pc.add_phase_object(dd, ["FieldOne", "FieldTwo", "CellMass"], weight=None, x_bins=100,y_bins=100, \
                     x_bounds=[1e0,1e10], y_bounds=[-10,10])

might do the job, but  yt returns the error message:

Warning: invalid value encountered in log10
yt : [ERROR    ] 2011-09-30 16:55:05,610 Your min/max values for x, y have 
given me a nan.
yt : [ERROR    ] 2011-09-30 16:55:05,610 Usually this means you are asking 
for log, with a zero bound.
Traceback (most recent call last):
   File "stability.py", line 352, in <module>
     x_bounds=[1e0,1e10], y_bounds=[-10,10])
   File 
"/nics/e/sw/analysis/yt/2.1/sles11.1_gnu4.3.4/src/yt-hg/yt/visualization/plot_collection.py", 
line 1149, in add_phase_object
     lazy_reader)
   File 
"/nics/e/sw/analysis/yt/2.1/sles11.1_gnu4.3.4/src/yt-hg/yt/data_objects/profiles.py", 
line 408, in __init__
     raise ValueError
ValueError

It appears that add_phase_object treats FieldTwo logarithmically, although 
it is linear.

So how can I do a log-linear phase plot?

Best,
Wolfram