ndslice.algorithm contains multidimensional ndMap and 10 basic iteration templates.

PR[1] contains section Asked Questions. It may help to understand the motivation of this module.

Current documentation is available in [2] -> algorithm. Please note, that it will be update based in your comments. If you want to see documentation with recent changes please visit
[1] -> CyberShadow/DAutoTest -> Phobos -> std.experimental.ndslice -> algorithm. If it is not available please wait a few minutes while CyberShadow/DAutoTest generates new versions of documentation.

Also the set of ndslice PRs [3] was already reviewed and can be merged.

[1] https://github.com/dlang/phobos/pull/4652
[2] http://dtest.thecybershadow.net/artifact/website-8f3b9764079e2ae4308b7956960c1717f829f251-7aa808dbd0b4b79a97cd7d239b571d5f/web/phobos-prerelease/std_experimental_ndslice.html
[3] https://github.com/dlang/phobos/pulls?q=is%3Apr+is%3Aopen+label%3Andslice

Best Regards,
Ilya

The PR and Mir v0.16.0-alpha7 have half and triangular selections. They are very helpful to work with matrixes.