matplotlib-users Mailing List for matplotlib

Hi,
I'm having a problem using matplotlibs barbs function. I'm trying to 
plot some wind barbs on a map created with basemap. My code is as follows,
 m =
 Basemap(llcrnrlon=-35.0,llcrnrlat=40.0,urcrnrlon=10.0,urcrnrlat=68.0,
 resolution='i',projection='lcc',lon_0=-12.5,lat_0=54.0)
 m.drawcoastlines()
 m.bluemarble()
 m.drawcoastlines()
 # draw parallels
 m.drawparallels(np.arange(40,68,5),labels=[1,0,0,0])
 # draw meridians
 m.drawmeridians(np.arange(-35, 10, 5),labels=[0,0,0,1])
 x, y = m(lons, lats)
 m.barbs(lons,lats,us,vs, barbcolor = 'r', flagcolor = 'r')
 plt.show()
where x, y, us and vs are lists with shape (64,). I get the following error,
 ERROR: An unexpected error occurred while tokenizing input
 The following traceback may be corrupted or invalid
 The error message is: ('EOF in multi-line statement', (382, 0))
 ---------------------------------------------------------------------------
 ValueError Traceback (most recent
 call last)
 /home/davcra/python_scripts/plot_synops.py in <module>()
 63 #m.plot(x,y,'ro', ms=5)
 64 plt.suptitle(record['date'])
 ---> 65 m.barbs(x,y,us,vs, barbcolor = 'r', flagcolor = 'r')
 66 #m.xlim(-35.0, 10.0)
 67 #m.ylim(40.0, 68.0)
 /usr/lib64/python2.6/site-packages/mpl_toolkits/basemap/__init__.pyc
 in barbs(self, x, y, u, v, *args, **kwargs)
 2924 retnh = ax.barbs(x,y,unh,vnh,*args,**kwargs)
 2925 kwargs['flip_barb']=True
 -> 2926 retsh = ax.barbs(x,y,ush,vsh,*args,**kwargs)
 2927 try:
 2928 plt.draw_if_interactive()
 /usr/lib64/python2.6/site-packages/matplotlib/axes.pyc in
 barbs(self, *args, **kw)
 5888 """
 5889 if not self._hold: self.cla()
 -> 5890 b = mquiver.Barbs(self, *args, **kw)
 5891 self.add_collection(b)
 5892 self.update_datalim(b.get_offsets())
 /usr/lib64/python2.6/site-packages/matplotlib/quiver.pyc in
 __init__(self, ax, *args, **kw)
 776 self.set_transform(transforms.IdentityTransform())
 777
 --> 778 self.set_UVC(u, v, c)
 779
 780 __init__.__doc__ = """
 /usr/lib64/python2.6/site-packages/matplotlib/quiver.pyc in
 set_UVC(self, U, V, C)
 952
 953 def set_UVC(self, U, V, C=None):
 --> 954 self.u = ma.masked_invalid(U, copy=False).ravel()
 955 self.v = ma.masked_invalid(V, copy=False).ravel()
 956 if C is not None:
 /usr/lib64/python2.6/site-packages/numpy/ma/core.pyc in
 masked_invalid(a, copy)
 1976 condition = ~(np.isfinite(a))
 1977 if hasattr(a, '_mask'):
 -> 1978 condition = mask_or(condition, a._mask)
 1979 cls = type(a)
 1980 else:
 /usr/lib64/python2.6/site-packages/numpy/ma/core.pyc in mask_or(m1,
 m2, copy, shrink)
 1383 _recursive_mask_or(m1, m2, newmask)
 1384 return newmask
 -> 1385 return make_mask(umath.logical_or(m1, m2), copy=copy,
 shrink=shrink)
 1386
 1387
 /usr/lib64/python2.6/site-packages/numpy/ma/core.pyc in make_mask(m,
 copy, shrink, flag, dtype)
 1265 # We won't return after this point to make sure we
 can shrink the mask
 1266 # Fill the mask in case there are missing data
 -> 1267 m = filled(m, True)
 1268 # Make sure the input dtype is valid
 1269 dtype = make_mask_descr(dtype)
 /usr/lib64/python2.6/site-packages/numpy/ma/core.pyc in filled(a,
 fill_value)
 406 """
 407 if hasattr(a, 'filled'):
 --> 408 return a.filled(fill_value)
 409 elif isinstance(a, ndarray):
 410 # Should we check for contiguity ? and
 a.flags['CONTIGUOUS']:
 /usr/lib64/python2.6/site-packages/numpy/ma/core.pyc in filled(self,
 fill_value)
 2929 result = self._data.copy()
 2930 try:
 -> 2931 np.putmask(result, m, fill_value)
 2932 except (TypeError, AttributeError):
 2933 fill_value = narray(fill_value, dtype=object)
 ValueError: putmask: mask and data must be the same size
 WARNING: Failure executing file: <plot_synops.py>
Anyone know whats going on here??
Thanks in advance,
D