HI,
I am trying to plot a time height diagram. here is the code used
dates=mpl.dates.date2num(data.index.to_pydatetime())
xh=list(dates)
dfX=pd.DataFrame(xh)
date2= dfX.groupby(np.arange(len(dfX))//400).mean()
dates=num2date(date2)
dfT=pd.DataFrame(data.iloc[:,5].reshape(400,427).T)
#dfT.insert(loc=0,column='',value=date)
hgtl=data.iloc[0:400:,1]
#plot(dates,dfT.iloc[:,0])
contourf(dates,hgtl,dfT.iloc[0:400:,0].T)
this results in the following error
TypeError Traceback (most recent call last)
<ipython-input-133-d1e220b1ce6a> in <module>()
8 hgtl=data.iloc[0:400:,1]
9 #plot(dates,dfT.iloc[:,0])
---> 10 contourf(dates,hgtl,dfT.iloc[0:400:,0].T)
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/pyplot.pyc in
contourf(*args, **kwargs)
2781 ax.hold(hold)
2782 try:
-> 2783 ret = ax.contourf(*args, **kwargs)
2784 finally:
2785 ax.hold(washold)
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/__init__.pyc
in inner(ax, *args, **kwargs)
1810 warnings.warn(msg % (label_namer,
func.__name__),
1811 RuntimeWarning, stacklevel=2)
-> 1812 return func(ax, *args, **kwargs)
1813 pre_doc = inner.__doc__
1814 if pre_doc is None:
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/axes/_axes.pyc
in contourf(self, *args, **kwargs)
5650 self.cla()
5651 kwargs['filled'] = True
-> 5652 return mcontour.QuadContourSet(self, *args, **kwargs)
5653 contourf.__doc__ = mcontour.QuadContourSet.contour_doc
5654
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/contour.pyc in
__init__(self, ax, *args, **kwargs)
1422 are described in QuadContourSet.contour_doc.
1423 """
-> 1424 ContourSet.__init__(self, ax, *args, **kwargs)
1425
1426 def _process_args(self, *args, **kwargs):
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/contour.pyc in
__init__(self, ax, *args, **kwargs)
861 self._transform = kwargs.get('transform', None)
862
--> 863 self._process_args(*args, **kwargs)
864 self._process_levels()
865
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/contour.pyc in
_process_args(self, *args, **kwargs)
1443 self._corner_mask =
mpl.rcParams['contour.corner_mask']
1444
-> 1445 x, y, z = self._contour_args(args, kwargs)
1446
1447 _mask = ma.getmask(z)
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/contour.pyc in
_contour_args(self, args, kwargs)
1526 args = args[1:]
1527 elif Nargs <= 4:
-> 1528 x, y, z = self._check_xyz(args[:3], kwargs)
1529 args = args[3:]
1530 else:
/home/nuncio/anaconda2/lib/python2.7/site-packages/matplotlib/contour.pyc in
_check_xyz(self, args, kwargs)
1555 y = self.ax.convert_yunits(y)
1556
-> 1557 x = np.asarray(x, dtype=np.float64)
1558 y = np.asarray(y, dtype=np.float64)
1559 z = ma.asarray(args[2], dtype=np.float64)
/home/nuncio/anaconda2/lib/python2.7/site-packages/numpy/core/numeric.pyc in
asarray(a, dtype, order)
472
473 """
--> 474 return array(a, dtype, copy=False, order=order)
475
476 def asanyarray(a, dtype=None, order=None):
*TypeError: float() argument must be a string or a number*
I identify this as the problem with using "dates" in contourf , however I do
not find any problem in running
plot(dates,dfT.iloc[:,0])
How to get around this
THanks and regards
nuncio
···
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