On Fri, Apr 24, 2020 at 10:13 AM Daniel DeFelippis <dad2183@columbia.edu> wrote:

Hello,

I'm trying to create a projection plot of velocity (e.g. velocity_x) for a halo from IllustrisTNG ('cutout_478037.hdf5' below). I'm using the demeshened version of yt (yt-4.0). When I try to do this it fails with the following error message. This only seems to occur when I try to make a projection of a quantity with positive and negative values. If I instead use 'density' or 'temperature' for example, it works fine. Any suggestions?

Thank you,
Daniel

ds = yt.load('cutout_478037.hdf5')
yt.ProjectionPlot(ds,'x',('gas','velocity_x'),width=(400,'kpc'))

---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
~/anaconda3/lib/python3.6/site-packages/numpy/core/function_base.py in linspace(start, stop, num, endpoint, retstep, dtype, axis)
116 try:
--> 117 num = operator.index(num)
118 except TypeError:

TypeError: 'numpy.float64' object cannot be interpreted as an integer

During handling of the above exception, another exception occurred:

TypeError Traceback (most recent call last)
<ipython-input-21-7770240b54f8> in <module>
1 ds = yt.load('cutout_478037.hdf5')
----> 2 yt.ProjectionPlot(ds,'x',('gas','velocity_x'),width=(400,'kpc'))
3 #slc.save('testplot.pdf')
4 #slc.set_zlim(('gas','radial_velocity'),-200,200)
5 #slc.annotate_title(title)

~/yt/yt/visualization/plot_window.py in __init__(self, ds, axis, fields, center, width, axes_unit, weight_field, max_level, origin, right_handed, fontsize, field_parameters, data_source, method, proj_style, window_size, buff_size, aspect)
1609 PWViewerMPL.__init__(self, proj, bounds, fields=fields, origin=origin,
1610 right_handed=right_handed, fontsize=fontsize, window_size=window_size,
-> 1611 aspect=aspect, buff_size=buff_size)
1612 if axes_unit is None:
1613 axes_unit = get_axes_unit(width, ds)

~/yt/yt/visualization/plot_window.py in __init__(self, *args, **kwargs)
780 self._plot_type = kwargs.pop("plot_type")
781 self._splat_color = kwargs.pop("splat_color", None)
--> 782 PlotWindow.__init__(self, *args, **kwargs)
783
784 def _setup_origin(self):

~/yt/yt/visualization/plot_window.py in __init__(self, data_source, bounds, buff_size, antialias, periodic, origin, oblique, right_handed, window_size, fields, fontsize, aspect, setup)
215 self._field_transform[field] = linear_transform
216 self.setup_callbacks()
--> 217 self._setup_plots()
218
219 def __iter__(self):

~/yt/yt/visualization/plot_window.py in _setup_plots(self)
1066 else: # symlog_transform
1067 flinthresh = 10**np.floor( np.log10( self.plots[f].cb.norm.linthresh ) )
-> 1068 mticks = self.plots[f].image.norm( get_symlog_minorticks(flinthresh, vmin, vmax) )
1069 self.plots[f].cax.yaxis.set_ticks(mticks, minor=True)
1070 else:

~/yt/yt/visualization/plot_container.py in get_symlog_minorticks(linthresh, vmin, vmax)
129 return np.hstack((-get_log_minorticks(linthresh,-vmin)[::-1], 0) )
130 else:
--> 131 return np.hstack((-get_log_minorticks(linthresh,-vmin)[::-1], 0,
132 get_log_minorticks(linthresh, vmax)))
133

~/yt/yt/visualization/plot_container.py in get_log_minorticks(vmin, vmax)
105 expA += 1
106 else:
--> 107 lmticks = np.hstack( (lmticks, np.linspace(cofA, cofB, cofB-cofA+1)*10**expA) )
108 expA += 1
109 return np.array(lmticks)

<__array_function__ internals> in linspace(*args, **kwargs)

~/anaconda3/lib/python3.6/site-packages/numpy/core/function_base.py in linspace(start, stop, num, endpoint, retstep, dtype, axis)
119 raise TypeError(
120 "object of type {} cannot be safely interpreted as an integer."
--> 121 .format(type(num)))
122
123 if num < 0:

TypeError: object of type <class 'numpy.float64'> cannot be safely interpreted as an integer.
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