issues: 112430028
This data as json
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 112430028 | MDU6SXNzdWUxMTI0MzAwMjg= | 634 | Unexpected behavior by diff when applied to coordinate DataArray | 6200806 | closed | 0 | 3 | 2015-10-20T18:26:58Z | 2015-12-04T20:40:31Z | 2015-12-04T20:40:31Z | CONTRIBUTOR |
``` In [5]: arr = xray.DataArray(range(0, 20, 2), dims=['lon'], coords=[range(10)]) In [6]: arr.diff('lon') <xray.DataArray (lon: 9)> array([2, 2, 2, 2, 2, 2, 2, 2, 2]) Coordinates: * lon (lon) int64 1 2 3 4 5 6 7 8 9 In [7]: arr['lon'].diff('lon') <xray.DataArray 'lon' (lon: 9)> array([1, 2, 3, 4, 5, 6, 7, 8, 9]) Coordinates: * lon (lon) int64 1 2 3 4 5 6 7 8 9 ``` Is this the intended behavior? The documentation doesn't mention anything about this, and its counter-intuitive, so I'm wondering if its a bug instead. Even if it is intended, I personally would like to be able to use a coordinate array's diff on itself to get its spacing, e.g. for use as the denominator in finite differencing approximations to derivatives. Thanks! |
{
"url": "https://api.github.com/repos/pydata/xarray/issues/634/reactions",
"total_count": 0,
"+1": 0,
"-1": 0,
"laugh": 0,
"hooray": 0,
"confused": 0,
"heart": 0,
"rocket": 0,
"eyes": 0
} |
completed | 13221727 | issue |