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ToDo
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* copy to buffer if non-contiguous. --done
* contract contiguous dimesions. --done
* transpose and flatten reduce dimeinsion to last user dimension. -- almost done.
* NArray with 1-d index and md-shape??
* enable a[a.sort_index] == a.sort for multi-dimensional array -- perhaps done.
* specify Input/Overwrite array -- already has OVERWRITE
* accept int-array as index argument of aref. -- done.
* convert binary from/to String -- done
* Complex#seq allows complex step -- done.
* Frozen array -- checking OBJ_FROZEN.
* Marshaling -- perhaps done except Bit, Struct.
* inspect Enumerable#step object -- done.
* contiguous check -- done.
* propagate_nan for min,max,sum,... -- done
* parsing keyword arguments -- use ruby api.
* use erbpp2 -- done
* switch to TypedData. -- done
* how to get the element size value effectively -- done
* introduce keyword :keepdims (keep dimension/axis) for reduce_dimension. -- done
* refactoring array.c: avoid using na_compose_t and na_ary_composition. -- done
* reshape! -- done
* flatten_dim
* name of new_zeros, zeros_like etc.
* NMath.sin => DFloat.sin ??
* contiguous if na_view->stridx == NULL ?
* store_binary with bite_swap.
* write barrier?
* delete Numo::Step class.
* move "reduce" field from RNArray to RNArrayView?
* unify RNArrayBase and RNArrayView structure??
* Thread-locked array??
* use rb_thread_call_without_gvl??
* alignment
* force buffering option
* update MT Random Number Generator
* GVL release
* Ctrl-C stop during method
* floor method should be same as Ruby floor or C99 floor ??
* constatntss
NAN
INF
EPS
* Matlab method:
logspace - done
meshgrid
rot90 - done
rad2deg - done
deg2rad - done
expm1 - done
histcount
* from numpy
<<,>> - done
swapaxis - done
squeeze
trace - done
ptp - done
clip - done
ravel
take
put - []=
choose choise
select
partition
searchsorted / bsearch
compress
pad
tile - done
copysign - done
bincount - done
unique
roll
repeat - done
logical_and/or/not - Bit & | ^
minimum,maximum
shuffle
interp
intersect1d
asarray - cast
persentile
Math
csc,sec,cot
csch,sech,coth
acsc,asec,acot
acsch,asech,acoth