issues

Please see the example below and the output it produces. And the exception is not really helpful...

``` python

from xarray import DataArray from datetime import datetime, timedelta

def main(): N = 48 data = range(N)

dates = [datetime(2001, 1, 1) + timedelta(hours=i) for i in range(N)]

# time variable is called the same as time dimension: works
scheme1 = {
    "dims": "t",
    "coords": {"t": {"dims": "t", "data": dates}},
    "data": data
}

# time variable is called differently from the time dimension: does not work
scheme2 = {
    "dims": "t",
    "coords": {"time": {"dims": "t", "data": dates}},
    "data": data
}

# Create DataArray objects using the above defined schemes a1 = DataArray.from_dict(scheme1) print(a1) print(a1.resample("D", "t")) print("=======================")

a2 = DataArray.from_dict(scheme2)
print(a2)
print(a2.resample("D", "t"))

if name == 'main': main() ```

Below is the output I get from running the script:

``` <xarray.DataArray (t: 48)> array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47]) Coordinates: * t (t) datetime64[ns] 2001-01-01 2001-01-01T01:00:00 ... <xarray.DataArray (t: 2)> array([ 11.5, 35.5]) Coordinates: * t (t) datetime64[ns] 2001-01-01 2001-01-02 ======================= <xarray.DataArray (t: 48)> array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47]) Coordinates: time (t) datetime64[ns] 2001-01-01 2001-01-01T01:00:00 ... * t (t) int64 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... Traceback (most recent call last): File "/Users/huziy/skynet2/RESCUE/skynet3_rech1/huziy/Netbeans Projects/Python/RPN/src/demo/xarray/time_dim_and_ops.py", line 46, in <module> main() File "/Users/huziy/skynet2/RESCUE/skynet3_rech1/huziy/Netbeans Projects/Python/RPN/src/demo/xarray/time_dim_and_ops.py", line 38, in main print(a2.resample("D", "t")) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/xarray/core/common.py", line 499, in resample gb = self.groupby_cls(self, group, grouper=time_grouper) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/xarray/core/groupby.py", line 202, in init first_items = s.groupby(grouper).first() File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/core/generic.py", line 3974, in groupby kwargs) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/core/groupby.py", line 1501, in groupby return klass(obj, by, kwds) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/core/groupby.py", line 370, in init mutated=self.mutated) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/core/groupby.py", line 2403, in _get_grouper binner, grouper, obj = key._get_grouper(obj) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/tseries/resample.py", line 1061, in _get_grouper r = self._get_resampler(obj) File "/Users/huziy/virtualenvs/py3.4/lib/python3.4/site-packages/pandas/tseries/resample.py", line 1057, in _get_resampler "but got an instance of %r" % type(ax).name) TypeError: Only valid with DatetimeIndex, TimedeltaIndex or PeriodIndex, but got an instance of 'Int64Index'

```

HI:

I was wondering if I have a dataarray based on 2d lon and lat fields is it possible to select values for selected lon and lat pairs?

Here is the schema of my DataArray:

python vardict = { "coords": { "t": {"dims": "t", "data": dates}, "lon": {"dims": ("x", "y"), "data": self.lons}, "lat": {"dims": ("x", "y"), "data": self.lats}, }, "dims": ("t", "x", "y"), "data": data_list, "name": varname_internal }

Is it possible to do smth like

python timeseries = da.sel(lon=-110, lat=65)

Cheers

Hi:

I've noticed that importing xarray fails when running a script using -OO option, as shown below.

``` $ python -OO test.py Traceback (most recent call last): File "test.py", line 2, in <module> import xarray File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/init.py", line 10, in <module> from .core.extensions import (register_dataarray_accessor, File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/extensions.py", line 7, in <module> from .dataarray import DataArray File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/core/dataarray.py", line 10, in <module> from ..plot.plot import _PlotMethods File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/init.py", line 4, in <module> from .plot import (plot, line, contourf, contour, File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 555, in <module> @_plot2d File "/Users/huziy/anaconda/envs/py3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 404, in _plot2d plotfunc.doc = '\n'.join((plotfunc.doc, commondoc)) TypeError: sequence item 0: expected str instance, NoneType found (py3.6) huziy at iMac-Sasha in ~/PythonProjects/xarray_playground

$ cat test.py

import xarray ```

• [x] Improves #1580
• [x] Tests passed
• [x] Passes git diff upstream/master | flake8 --diff
• [x] Fully documented, including whats-new.rst for all changes and api.rst for new API

• [x] Closes #438
• [x] Added tests (they are passing currently)

• [x] Passes git diff upstream/master | flake8 --diff There were some long lines that in my opinion look better when not broken, but I complied with flake8 request to shorten them.

• [x] Fully documented, including whats-new.rst for all changes and api.rst for new API (Do not think the change is big enough to be added to the files)

…ause it can be greater than 12 for high-resolution screens

• [x] Closes #1584
• [ ] Tests passed Not sure why continuous integration checks are failing. Do not hink this is because of the change, since the master branch is also failing the continuous integration checks.
• [x] Passes git diff upstream/master | flake8 --diff
• [x] Fully documented, including whats-new.rst for all changes and api.rst for new API Change is too small for whats-new.rst or api.rst.

Hi:

The test below is failing on my machine, but I am not sure what is its purpose. In my opinion, it could be removed. But maybe I am missing something.

``` xarray/tests/test_plot.py F xarray/tests/test_plot.py:1027 (TestFacetGrid.test_no_args) self = <xarray.tests.test_plot.TestFacetGrid testMethod=test_no_args>

@pytest.mark.slow
def test_no_args(self):
    self.g.map_dataarray(xplt.contourf, 'x', 'y')

    # Don't want colorbar labeled with 'None'
    alltxt = text_in_fig()
    self.assertNotIn('None', alltxt)

    for ax in self.g.axes.flat:
        self.assertTrue(ax.has_data())

        # default font size should be small
        fontsize = ax.title.get_size()

      self.assertLessEqual(fontsize, 12)

E AssertionError: 16.0 not less than or equal to 12

xarray/tests/test_plot.py:1041: AssertionError

```

Cheers