issues: 268487752

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
268487752 MDU6SXNzdWUyNjg0ODc3NTI= 1661 da.plot.pcolormesh fails when there is a datetime coordinate 500246 closed 0     9 2017-10-25T17:44:38Z 2017-10-29T17:28:55Z 2017-10-29T17:28:55Z CONTRIBUTOR      

da.plot.pcolormesh, where da is a DataArray, fails with TypeError: invalid type promotion when one of the coordinates is a datetime array:

``` $ cat mwe.py

!/usr/bin/env python3.6

import xarray import numpy

da = xarray.DataArray( numpy.arange(3*4).reshape(3,4), dims=("x", "y"), coords={"x": [1,2,3], "y": [numpy.datetime64(f"2000-01-{x:02d}") for x in range(1, 5)]})

da.plot.pcolormesh() $ ./mwe.py Traceback (most recent call last): File "./mwe.py", line 13, in <module> da.plot.pcolormesh() File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 547, in plotmethod return newplotfunc(allargs) File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 500, in newplotfunc kwargs) File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/xarray/plot/plot.py", line 667, in pcolormesh primitive = ax.pcolormesh(x, y, z, kwargs) File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/matplotlib/init.py", line 1710, in inner return func(ax, *args, kwargs) File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/matplotlib/axes/_axes.py", line 5636, in pcolormesh coords = np.column_stack((X, Y)).astype(float, copy=False) File "/dev/shm/gerrit/venv/stable-3.6/lib/python3.6/site-packages/numpy/lib/shape_base.py", line 353, in column_stack return _nx.concatenate(arrays, 1) TypeError: invalid type promotion ```

 
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