addcyclic problem with grib2 data

Nessuno ha ancora preso questa issue.

I have some problems to use add cyclic with data from grib2 file.

This is my code:

``` python
# -*- coding: utf-8 -*-

import pygrib
import numpy as np

from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure

from mpl_toolkits.basemap import Basemap, addcyclic

fig = Figure((4, 3))
canvas = FigureCanvas(fig)
ax = fig.add_axes([0.05, 0.05, 0.9, 0.9])

# File download from http://para.nomads.ncep.noaa.gov/pub/data/nccf/com/gfs/para/gfs.2016041918/gfs.t18z.pgrb2.0p25.f000
grbindx = pygrib.index('gfs.t18z.pgrb2.0p25.f000', 'shortName', 'typeOfLevel', 'level')
grb = grbindx.select(shortName='2t', typeOfLevel='heightAboveGround', level=2)[0]
lats, lons = grb.latlons()
temp = grb.values

temp, lons = addcyclic(temp, lons)

bm = Basemap(projection='mill', resolution='l', ax=ax,
llcrnrlat=32, urcrnrlat=70, llcrnrlon=-25,
urcrnrlon=40.5, lat_ts=20)

x, y = bm(lons, lats)
bm.contourf(x, y, temp)

bm.drawcoastlines()

canvas.print_figure('gfs_temperature_2m.png', dpi=100)
```

With `python 2.7.11` and `basemap 1.0.7` this is the result:

```
Traceback (most recent call last):
File "addcyclic.py", line 21, in
temp, lons = addcyclic(temp, lons)
File "/usr/local/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.py", line 5062, in addcyclic
lonsout[0:nlons] = lonsin[:]
ValueError: could not broadcast input array from shape (721,1440) into shape (1440)
```

With `python 2.7.11` and `basemap 1.0.8` (from latest github commit) this is the result:

```
Traceback (most recent call last):
File "addcyclic.py", line 27, in
x, y = bm(lons, lats)
File "/usr/local/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.py", line 1175, in __call__
xout,yout = self.projtran(x,y,inverse=inverse)
File "/usr/local/lib/python2.7/site-packages/mpl_toolkits/basemap/proj.py", line 286, in __call__
outx,outy = self._proj4(x, y, inverse=inverse)
File "/usr/local/lib/python2.7/site-packages/pyproj/__init__.py", line 399, in __call__
_proj.Proj._fwd(self, inx, iny, radians=radians, errcheck=errcheck)
File "_proj.pyx", line 128, in _proj.Proj._fwd (_proj.c:1678)
RuntimeError: Buffer lengths not the same
```

Where is the problem?
Some bug in basemap? Or in my code?

Without addcycle this is the result:

Thanks
Andrew

Eseguire lo script Python fornito con le versioni di Basemap indicate e ispezionare la chiamata a addcyclic, seguita da Basemap.__call__ e dalla conversione pyproj riportata. Confrontare le forme di temp, lons e lats prima e dopo addcyclic. Il lavoro è completato quando l'esempio GRIB2 termina con array di coordinate corrispondenti e produce il grafico di contorno previsto.

Scritto dal modello di indicizzazione a partire dal testo della issue.