On Thursday, 7 September 2017 at 12:04:12 UTC, jmh530 wrote:
I think what's missing from the documentation is a clear
explanation of how the strides determine how the iterator
moves. Even something like below (assuming I have the math
right) would be an improvement, though I'm sure there is a
clearer way to express the concept.
auto x = iota(3, 4).universal;
assert(x.strides == [4, 1]);
assert(x[2, 3] == 6); //(2 - 1) * 4 + (3 - 1) * 1
auto y = x.transposed;
assert(y.strides == [1, 4]);
assert(y[2, 3] == 9); //(2 - 1) * 1 + (3 - 1) * 4
Hmm, maybe I can express this better as something like
auto data = iota(12);
auto x = data.sliced(2, 3).universal;
assert(x.strides == [4, 1]);
assert(x[2, 3] == data[(2 - 1) * 4 + (3 - 1) * 1]);
auto y = x.transposed;
assert(y.strides == [1, 4]);
assert(y[2, 3] == data[(2 - 1) * 1 + (3 - 1) * 4]);
