issues: 714905042

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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
714905042 MDU6SXNzdWU3MTQ5MDUwNDI= 4486 Feature request: xr.concat: `stack` parameter 2129135 open 0     1 2020-10-05T14:43:40Z 2021-07-08T17:44:38Z   NONE      

Is your feature request related to a problem? Please describe. In the case of dependent dimensions, there is a lot of missing data, and using a stacked layout is preferable. Composing an array using concat and then stack is not very memory efficient and results in NaN's that have to be removed.

I am now composing an array using concat and then reshaping using stack. This can consume a lot of memory, and requires explicit removal of the NaN's after stacking. Having a stack parameter to concat that takes the desired index would be very useful.

Describe the solution you'd like A stack parameter to concat that takes the desired index would be very useful.

Initially it may just do the naive concat followed by a stack and removal of NaN, but eventually it should insert items correctly without creating NaN.

Describe alternatives you've considered Composing an array using concat and then stack is not very memory efficient and results in NaN's that have to be removed.

Additional context Issue related to concat and stack https://github.com/pydata/xarray/issues/981.

 
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