issue_comments: 249618769

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https://github.com/pydata/xarray/pull/1017#issuecomment-249618769 https://api.github.com/repos/pydata/xarray/issues/1017 249618769 MDEyOklzc3VlQ29tbWVudDI0OTYxODc2OQ== 1217238 2016-09-26T16:17:28Z 2016-09-26T16:18:55Z MEMBER

@gdementen Thanks for chiming in! Yes, in practice I think "no index" for xarray will work almost exactly the same as your "wildcard index".

The only advantage I can think of now (except it was easier for me to implement it this way) of having a "wildcard axis" instead of no index/labels at all is that a subset could keep the information about which "tick" it comes from (again without blocking alignment). Not sure it's worth it though (I have actually not implemented it this way yet, but I was contemplating doing so).

I'm not a fan of this one. It's a perpetual minor annoyance with pandas to subset a meaningless range(n) index only to get non-sensical tick labels. Also, keeping track of tick labels but not using them for alignment makes it less obvious that a dimension doesn't have an index.

 
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