[yt-users] Problem making line plots

[Yuxiao Dai]

Dear all,


I tried to inspect the magnetic field profile in one snap of my enzo output
with the code:

#############################################

from yt.mods import * # set up our namespace

import numpy as np

import pylab as P

def _BMag(field, data):

    return np.sqrt(data["Bx"] * data["Bx"] + data["By"] * data["By"] +
data["Bz"] * data["Bz"])

    add_field("BMag", function=_BMag)


    c = pf.h.find_max('BMag')[1]

    ax = 0

    ray = pf.h.ortho_ray(ax, (c[1], c[2]))



    P.subplot(212)

    P.semilogy(ray['x'], ray['BMag'])

    P.xlabel('x')

    P.ylabel('BMag')

    print "works"

    P.savefig("BMag_lineplot.png")

#############################################

But keep getting this error message.

#############################################

(yt-x86_64)[yd742 at ria run5]$ python ytplots_BMag_lineplot_dai.py

yt : [INFO     ] 2016-03-12 19:19:31,279 Parameters: current_time
    = 0

yt : [INFO     ] 2016-03-12 19:19:31,279 Parameters: domain_dimensions
    = [128  64  64]

yt : [INFO     ] 2016-03-12 19:19:31,279 Parameters: domain_left_edge
    = [-6000. -3000. -3000.]

yt : [INFO     ] 2016-03-12 19:19:31,280 Parameters: domain_right_edge
    = [ 6000.  3000.  3000.]

yt : [INFO     ] 2016-03-12 19:19:31,280 Parameters:
cosmological_simulation   = 0.0

Parsing Hierarchy 100%
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Time:
00:00:00

yt : [INFO     ] 2016-03-12 19:19:31,285 Gathering a field list (this may
take a moment.)

yt : [INFO     ] 2016-03-12 19:19:31,290 Adding unknown field Phi to list
of fields

yt : [INFO     ] 2016-03-12 19:19:31,290 Adding unknown field B_Vorticity2
to list of fields

yt : [INFO     ] 2016-03-12 19:19:31,290 Adding unknown field B_Vorticity3
to list of fields

yt : [INFO     ] 2016-03-12 19:19:31,290 Adding unknown field B_Vorticity1
to list of fields

yt : [INFO     ] 2016-03-12 19:19:31,290 Adding unknown field B_Div to list
of fields

yt : [INFO     ] 2016-03-12 19:19:32,705 Max Value is 8.56382e-05 at
-2501.9531250000000000 29.2968750000000000 228.5156250000000000 in grid
EnzoGrid_0005 at level 3 (16, 16, 15)

yt : [INFO     ] 2016-03-12 19:19:32,705 Getting field x from 4

Traceback (most recent call last):

  File "ytplots_BMag_lineplot_dai.py", line 45, in <module>

    P.subplot(212)

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.3.0-py2.7-linux-x86_64.egg/matplotlib/pyplot.py",
line 896, in subplot

    fig = gcf()

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.3.0-py2.7-linux-x86_64.egg/matplotlib/pyplot.py",
line 450, in gcf

    return figure()

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.3.0-py2.7-linux-x86_64.egg/matplotlib/pyplot.py",
line 423, in figure

    **kwargs)

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.3.0-py2.7-linux-x86_64.egg/matplotlib/backends/backend_tkagg.py",
line 79, in new_figure_manager

    return new_figure_manager_given_figure(num, figure)

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.3.0-py2.7-linux-x86_64.egg/matplotlib/backends/backend_tkagg.py",
line 87, in new_figure_manager_given_figure

    window = Tk.Tk()

  File
"/home/yd742/software/withpysci/yt-x86_64/lib/python2.7/lib-tk/Tkinter.py",
line 1745, in __init__

    self.tk = _tkinter.create(screenName, baseName, className, interactive,
wantobjects, useTk, sync, use)

_tkinter.TclError: no display name and no $DISPLAY environment variable

#############################################

I'm using yt

Version = 2.6.1

Changeset = c994959ed3be

=======================

I would very much appreciate it if anyone could help me on this.


Thank you so much.


Regards,

Dai
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