Java slicing multidimensional array library

Question

Is there a Java array library which supports slicing? I just need regular n x n' x n'' x ... arrays and either taking one slice from given dimension or whole dimension (i.e. no need for ranges).

Notes (read replies to potential comments):

I know that regular Java arrays are not supporting it and I'm not willing to write my own slicing library.
Using Collection (suggested in comment to other question) based shifts the problem
Using System.arraycopy does not help in high dimension as it does not lower the nesting of loops significantly
This is (sort of - long story) numerical problem so OO approach for inner code is not necessary the best one - the most usable abstraction boils down to slicing anyway
I would prefer R/W view from slice (if it will only be R/O copy I won't complain though)

EDIT: Unfortunaly I need to store objects inside array - not only double's.

maybe you are using the wrong tool(java) for the job? Alternatively, would a map with each dimension as a key work? — drone-ah
– drone-ah, Commented Feb 16, 2013 at 10:55
@drone.ah: It's long story but based on description it is what I would say as well. — Maja Piechotka
– Maja Piechotka, Commented Feb 16, 2013 at 15:29

mikera · Accepted Answer · 2013-02-16 12:09:48Z

5

Vectorz is a vector/matrix library supports slicing and is a good choice if you are doing numerical work with arrays of double values. It is specifically designed for vector/matrix maths in 3D modelling, gaining, simulation or machine learning contexts.

Advantages:

Very fast (everything backed by primitive doubles and double[] arrays)
100% Pure Java
Supports arbitrary slicing and dicing, mostly as O(1) operations (i.e. no data copying required)
Slices are fully read/write enabled, i.e. you can use them to modify the original structures
You can also join vectors together, take subvector views etc.
Specialised classes for numerical work, e.g. diagonal matrices etc.

It currently supports 0, 1 and 2 dimensional arrays, higher dimensional arrays are planned but not yet implemented.

answered Feb 16, 2013 at 12:09

mikera

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2 Comments

Maja Piechotka Over a year ago

+1. Looks nice however I need something to store an object inside array - not only double (I admit - I might mislead by using 'numerical' inside description).

WestCoastProjects Over a year ago

Nice library. It seems to be modeled after numpy arrays. V fast, but does not have many features.

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