On Tuesday, 13 March 2018 at 05:36:06 UTC, J-S Caux wrote:

Your suggestion [4] that matrix[i] returns a Vec is perhaps too inflexible. What one needs sometimes is to return a row, or a column of a matrix, so a notation like matrix[i, ..] or matrix[.., j] returning respectively a row or column would be useful.

auto row = matrix[i]; // or matrix[i, 0 .. $];
auto col = matrix[0 .. $, j];

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