I've been going through

https://github.com/johnwcowan/r7rs-work/blob/master/ArraysCowan.md

to compare that proposal with routines provided in SRFI 231.  While each
proposal assumes certain patterns of programming, I think SRFI 231
covers the routines in ArraysCowan pretty well.

There's also the somewhat informal proposal

https://github.com/johnwcowan/r7rs-work/blob/master/ArraySlicesBreuel.md

Perhaps this was written by Thomas Breuel:

http://www.tmbdev.net/

It emphasizes a concept of "slices", which I believe is the same as the
affine transformations of SRFI 231.

Brad