Generalize shift infrastructure.

[dalejung]

Currently Panel.shift has its own code-path that is 4 years old. Change it to use the generic shift code found in generic.py/internals.py.

[dalejung]

dalejung/pandas@panel-tshift-4853...general-shift-4867

[dalejung]

@wesm was there a specific reason that Panel.shift dropped periods, as opposed to DataFrame.shift that kept a NaN row?

Maybe too late to change that behavior?

[wesm]

Was to avoid the huge allocate-copy step IIRC

[jreback]

@dalejung how's this coming?

[dalejung]

I've been running production code on my branch with panel + general shift. Passed internal tests. Got busy while rewriting the tests. Should have time to circle back later on this week.

On Oct 4, 2013, at 4:12 PM, jreback notifications@github.com wrote:

@dalejung how's this coming?

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