Clojure Matrix Representation

Question

What is a good representation for matrices in Clojure? I\'m interested in dealing with dense matrices of floating point numbers. The \"list of lists\" representation springs

Answer 1

Incanter supplies a wrapper around some of Parallel Colt, including what looks to be a pretty decent implementation of fast, parallelized dense matrices that interface with Clojure's seq-based libraries. I haven't used it, but it should be what you're looking for.

Example.

Answer 2

Check out the core.matrix proposal + experimental implementation here:

https://github.com/mikera/matrix-api

Very early days at time of writing, but worth keeping an eye on.

Answer 3

the answers may need to be updated as 8 years passed. A quick google search shows that if you need to be compatible with Clojure core.matrix API, you can use core.matrix itself or other implementations such as vectorz-clj.

In addition I found Neanderthal which is optimized for GPU

Answer 4

I'm writing a matrix library wrapping jblas called, tentatively, Clatrix. It's missing a lot of features I still want to add, but it's got most of what you might be looking for. Take a look, http://github.com/tel/clatrix.

Answer 5

I am presently using the list of lists approach in cryptovide because its very important for this application to keep things lazy. I am also considering switching to a more efficient approach as long as it kept at least the outward representation lazy.

Answer 6

I recently wrote some code that needed matrix maths, and initially I used vector-of-vectors, map & reduce, but found the resulting code hard to understand when I returned to it (I'm new to Clojure mind). Incanter made the same code very terse, easy to understand (standard matrix ops) and much much faster.