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digitalmars.D - ndslice: allow: a[ _, 9, R(2, $, -3)] as matlab's a[: ,9,

reply Timothee Cour via Digitalmars-d <digitalmars-d puremagic.com> writes:
i wrote my own tensor library a while ago and it allows the more convenient
matlab/python+numpy like syntax:

a[ _, 9, R(2, $, -3)]
these are allowed:
R() or _: full range for an index
R(a,b): a..b
R(a,b,s): when s>0, iota(a,b,s)
R(a,b,s): when s<0, iota(a,b,-s).reverse

Could we have this in ndslice?
Jan 08
parent reply Ilya <ilyayaroshenko gmail.com> writes:
On Saturday, 9 January 2016 at 00:26:42 UTC, Timothee Cour wrote:
 i wrote my own tensor library a while ago and it allows the 
 more convenient matlab/python+numpy like syntax:

 a[ _, 9, R(2, $, -3)]
 these are allowed:
 R() or _: full range for an index
 R(a,b): a..b
 R(a,b,s): when s>0, iota(a,b,s)
 R(a,b,s): when s<0, iota(a,b,-s).reverse

 Could we have this in ndslice?
Is `a[ _, 9, R(2, $, -3)]` equals to `a[0..$, 9, 2..$].reversed!2.strided!2(3)` or `a[0..$, 9, 2..$].strided!2(3).reversed!2` ?
Jan 08
parent reply Ilya Yaroshenko <ilyayaroshenko gmail.com> writes:
On Saturday, 9 January 2016 at 06:20:46 UTC, Ilya wrote:
 On Saturday, 9 January 2016 at 00:26:42 UTC, Timothee Cour 
 wrote:
 i wrote my own tensor library a while ago and it allows the 
 more convenient matlab/python+numpy like syntax:

 a[ _, 9, R(2, $, -3)]
 these are allowed:
 R() or _: full range for an index
 R(a,b): a..b
 R(a,b,s): when s>0, iota(a,b,s)
 R(a,b,s): when s<0, iota(a,b,-s).reverse

 Could we have this in ndslice?
Is `a[ _, 9, R(2, $, -3)]` equals to `a[0..$, 9, 2..$].reversed!2.strided!2(3)` or `a[0..$, 9, 2..$].strided!2(3).reversed!2` ?
My bad. You have already wrote `iota(a,b,-s).reverse`. We can test this kind of syntax in Mir first https://github.com/DlangScience/mir --Ilya
Jan 08
parent Timothee Cour via Digitalmars-d <digitalmars-d puremagic.com> writes:
After more thought (since you have freedom of redesigning from scratch),
how about this:

https://docs.google.com/document/d/1cEf8AynZEZxlTENJx1i4w1GTB481bbc4iUbUeJT00-U/edit#heading=h.uxrd8sd74w8r



On Fri, Jan 8, 2016 at 11:00 PM, Ilya Yaroshenko via Digitalmars-d <
digitalmars-d puremagic.com> wrote:

 On Saturday, 9 January 2016 at 06:20:46 UTC, Ilya wrote:

 On Saturday, 9 January 2016 at 00:26:42 UTC, Timothee Cour wrote:

 i wrote my own tensor library a while ago and it allows the more
 convenient matlab/python+numpy like syntax:

 a[ _, 9, R(2, $, -3)]
 these are allowed:
 R() or _: full range for an index
 R(a,b): a..b
 R(a,b,s): when s>0, iota(a,b,s)
 R(a,b,s): when s<0, iota(a,b,-s).reverse

 Could we have this in ndslice?
Is `a[ _, 9, R(2, $, -3)]` equals to `a[0..$, 9, 2..$].reversed!2.strided!2(3)` or `a[0..$, 9, 2..$].strided!2(3).reversed!2` ?
My bad. You have already wrote `iota(a,b,-s).reverse`. We can test this kind of syntax in Mir first https://github.com/DlangScience/mir --Ilya
Jan 08