issues: 36354140

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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
36354140 MDExOlB1bGxSZXF1ZXN0MTc1MTMyNjY= 172 {DataArray,Dataset}.indexes no longer creates a new dict 1217238 closed 0   650893 0 2014-06-24T05:10:25Z 2014-06-24T05:34:38Z 2014-06-24T05:34:36Z MEMBER   0 pydata/xarray/pulls/172

According to the toy benchmark below, this shaves off between 20% (diff-indexes) to 40% (same-indexes) of xray's overhead for array math:

import numpy as np import xray x = np.random.randn(1000, 1000) y = np.random.randn(1000, 1000) dx = xray.DataArray(x) dy = xray.DataArray(y) %timeit x + x # raw-numpy %timeit dx + dx # same-indexes %timeit dx + dy # diff-indexes

 
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