Metpy.plots.skewT.plot_barbs引发此错误：

TypeError: ufunc 'isfinite' not supported for the input types,and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

当给定3个Numpy数组时：pressure，u和v。

其他报告此错误消息的用户未使用正确的dtype或将np用作变量名。我已经证实，这两种情况都不是我的原因。我也尝试过从u和v数组中删除单位。

import numpy as np
import metpy.plots as mpplots

# units comes from another file

pres = np.array([nan,96950.26215278,96877.55755208,96763.37230603,96652.54882812]) * units.pascal
u = np.array([nan,0.36735288,0.44829027,1.29182593,-0.94374102]) * units.meter / units.second
v = np.array([nan,4.61110612,5.74110696,6.01459714,5.5652721]) * units.meter / units.second

rotation = 30
fig = mpplots.SkewT(rotation=rotation,aspect=80.5)
fig.ax.yaxis.set_major_locator(ticker.MultipleLocator(5))
fig.plot(pres,temp,'r',label="Temperature")
fig.plot(pres,t_d,'g',label="Dewpoint")
fig.ax.set_ylim(np.nanmax(pres.to(units.hPa).magnitude) + 10,np.nanmin(pres.to(units.hPa).magnitude) - 20)
fig.ax.set_xlim(np.nanmin(t_d.to(units.degC).magnitude) - 5,np.nanmax(temp.to(units.degC).magnitude) + 10)
fig.plot_dry_adiabats(linewidth=0.5,label="Dry Adiabats")
fig.plot_moist_adiabats(linewidth=0.5,label="Moist Adiabats")
fig.plot_mixing_lines(linewidth=0.5,label="Mixing Ratio")
fig.plot_barbs(np.array(pres.magnitude,dtype='float64') * pres.units,np.array(u.magnitude,dtype='float64') * u.units,np.array(v.magnitude,dtype='float64') * v.units)

Traceback (most recent call last):
  File "/snap/pycharm-professional/167/helpers/pydev/pydevd.py",line 1415,in _exec
    pydev_imports.execfile(file,globals,locals)  # execute the script
  File "/snap/pycharm-professional/167/helpers/pydev/_pydev_imps/_pydev_execfile.py",line 18,in execfile
    exec(compile(contents+"\n",file,'exec'),glob,loc)
  File "/home/.../sample_analysis.py",line 43,in <module>
    fig = plotting.plot_skewT(temp=temp,pres=pres,t_d=t_d,u=u,v=v,units=units)
  File "/home/.../plotting.py",line 248,in plot_skewT
    np.array(v.magnitude,dtype='float64') * v.units)
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/metpy/plots/skewt.py",line 440,in plot_barbs
    clip_on=True,zorder=2,**kwargs)
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/matplotlib/__init__.py",line 1785,in inner
    return func(ax,*args,**kwargs)
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/matplotlib/axes/_axes.py",line 4874,in barbs
    b = mquiver.Barbs(self,**kw)
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/matplotlib/quiver.py",line 965,in __init__
    self.set_UVC(u,v,c)
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/matplotlib/quiver.py",line 1145,in set_UVC
    self.u = ma.masked_invalid(U,copy=False).ravel()
  File "/home/.../miniconda3/envs/Profiles/lib/python3.7/site-packages/numpy/ma/core.py",line 2366,in masked_invalid
    condition = ~(np.isfinite(a))
TypeError: ufunc 'isfinite' not supported for the input types,and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

Process finished with exit code 1