Panelnd

[jreback]

Panel4D

( note - this superseeds the prior branch, FDPanel and this is 0.9rc1 compatible)

Panel4D is like a Panel object, but provides 4 dimensions
labels, items, major_axis, minor_axis

instead of using a dict of Panels to hold data, the Panel4D provides a convenient represenation in pandas space with named dimensions to allow easy axis swapping and slicing

testing

tests/test_panel4d.py provides a similar methodology to test_panel.py

Panel4D required an overhall of many methods in panel.py and one change in core/index.py (regarding multi-indexing)
almost all methods in a Panel are extended to Panel4D (with the exception in that Panel
now allows a multi-axis on axis 0)

docstrings need to be refreshed a bit and made a bit more general

all tests that are not skipped pass (tested with 0.9rc1)

join is a work in progress

further

panelnd.py provides a factory function for creation of generic panel-like ND structures with custom named dimensions
(this works, but not fully tested - examples are in the docstring)

[wesm]

Merged this-- we'll mark it experimental in the release so there's no major expectation of API stability for the time being-- there were a few 644->755 file mode switches I had to fix

[jreback]

awesome! in that case will write up some docs prob tomorrow...separate PR? or just push to this one?

[wesm]

separate PR would be great!

[jreback]

will do....

btw...assume you are working on this...but just pulled from master:

[sheep-jreback-~/pandas] python setup.py build_ext --inplace
running build_ext
skipping 'pandas/index.c' Cython extension (up-to-date)
cythoning pandas/tslib.pyx to pandas/tslib.c

Error compiling Cython file:
------------------------------------------------------------
...

cdef PyTypeObject* ts_type = <PyTypeObject*> Timestamp


cdef inline bint is_timestamp(object o):
    return Py_TYPE(o) == ts_type # isinstance(o, Timestamp)
                 ^
------------------------------------------------------------

pandas/tslib.pyx:516:18: undeclared name not builtin: Py_TYPE

Error compiling Cython file:
------------------------------------------------------------
...

cdef PyTypeObject* ts_type = <PyTypeObject*> Timestamp


cdef inline bint is_timestamp(object o):
    return Py_TYPE(o) == ts_type # isinstance(o, Timestamp)
                     ^
------------------------------------------------------------

pandas/tslib.pyx:516:22: Invalid types for '==' (Python object, PyTypeObject *)
building 'pandas.tslib' extension
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/lib/python2.7/site-packages/numpy/core/include -Ipandas/src/klib -Ipandas/src -I/usr/local/include/python2.7 -c pandas/tslib.c -o build/temp.linux-x86_64-2.7/pandas/tslib.o
pandas/tslib.c:1:2: error: #error Do not use this file, it is the result of a failed Cython compilation.
error: command 'gcc' failed with exit status 1

[wesm]

What version of Cython? Working OK with 0.17.2

[jreback]

was on 0.16...updated to 0.17.2 and worked great! (I think this never came up before because the files are already cythonized....in master)..

[jreback]

getting failure on: test_to_excel (in tests/test_panel.py).....? (the read pack frame's index is not matching...looks like it is a list of numbers rather than a DatetimeIndex)

[wesm]

You may have to upgrade your openpyxl install

[jreback]

that fixed it.....maybe should list dependcy versions somewhere?

[wesm]

Yeah. I'll make an issue to update the docs/readme.rst