On Saturday, 3 June 2017 at 05:21:13 UTC, 9il wrote:
On Friday, 2 June 2017 at 16:08:20 UTC, Zz wrote:
Hi,
Just tried migrating from std.experimental.ndslice to
mir-algorithm.
Is there a guide on how migrate old code?
I used the following imports before and using then with
ndslice.
import std.experimental.ndslice;
import std.algorithm : each, max, sort;
import std.range : iota, repeat;
simplified example of how it was used.
auto a = cr.iota.sliced(r, c);
auto b = a.reshape(c, r).transposed!1;
auto c = a.reversed!1;
auto d = a.reshape(c, r).transposed!1.reversed!1;
auto f = new int[cr].sliced(r, c);
auto h = f.transposed(1);
how can I do the following in mir-algorithm.
Note: I will be going through the documentation.
Zz
Hello Zz,
std.experimental.ndslice -> mir.ndslice
std.range : iota, repeat -> mir.ndslice.topology: iota, repeat;
std.algorithm : each; -> mir.ndslice.algorithm: each;
std.algorithm : max; -> mir.utility: max;
std.algorithm : sort; -> mir.ndslice.sorting: sort;
Note, that Mir functions has different semantics compared with
Phobos!
For example, each iterates deep elements, so should be combined
with `pack` to iterates rows instead of elements.
Ndslices work with Phobos functions but it is suggested to use
Mir analogs if any.
// Mir's iota! It is already 2D ndslice :-)
auto a = [r, c].iota;
auto b = a
// returns flattened iota, a has Contiguous kind,
// so the result type would be equal to `iota(r*c)`
.flattened
// convert 1D iota ndslice to 2D iota ndslice
.sliced(c, r)
// It is required to use transposed
// Convert ndslice kind from Contiguous to Universal.
.universal
// Transpose the Universal ndslice
.transposed;
auto c = a.universal.reversed!1;
auto d = a.flattened.sliced(c,
r).universal.transposed!1.reversed!1; // see also `rotated`
auto f = slice!int(c, r); // new int[cr].sliced(r, c); works
too.
auto h = f.universal.transposed(1);
-------
Mir ndslices have three kinds:
http://docs.algorithm.dlang.io/latest/mir_ndslice_slice.html#.SliceKind
If you have any questions feel free to ask at the Gitter:
https://gitter.im/libmir/public
Best,
Ilya
Best,
Ilya
Thanks
