I'm referring to the example
http://docs.random.dlang.io/latest/mir_random_algorithm.html#.sample

Could somebody tell me, why

´´´
import mir.random.algorithm;
import std.range; //import mir.range;

void main()
{ // line 5
	size_t[] arr;
	arr.length = 42;
	arr = arr.length.iota.array;
	auto res = rne.sample(arr, 1);
} // line 10
´´´
refuses to compile?

The error message is

/Users/alex/.dub/packages/mir-random-2.1.1/mir-random/source/mir/random/algorithm.d(551,23): Error: no property popFrontExactly for type ulong[]
/Users/alex/.dub/packages/mir-random-2.1.1/mir-random/source/mir/random/algorithm.d(558,13): Error: template instance `mir.random.algorithm.RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]).RandomSample.__ctor!()` error instantiating
/Users/alex/.dub/packages/mir-random-2.1.1/mir-random/source/mir/random/algorithm.d(448,35):        instantiated from here: __ctor!()
source/app.d(9,23):        instantiated from here: sample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[])
dmd failed with exit code 1.

On Wednesday, 7 November 2018 at 09:33:32 UTC, Alex wrote:
> I'm referring to the example
> http://docs.random.dlang.io/latest/mir_random_algorithm.html#.sample
>
> [...]

This is a regression. It is fixed in mir-random v2.1.2.

On Wednesday, 7 November 2018 at 14:07:32 UTC, 9il wrote:
> This is a regression. It is fixed in mir-random v2.1.2.

Thanks. But I have another one:

´´´
import mir.random.algorithm;
import std.experimental.all;

void main()
{
	S[] arr;
	arr.length = 42;
	arr.each!((i, ref el) => el.i = i);
	auto res = rne.sample(arr.map!((ref el) => el.i), 1);
}

struct S { size_t i; }
´´´

Does not depend, on whether I use (ref el) or just el... And should not depend on that ;)

On Wednesday, 7 November 2018 at 14:46:17 UTC, Alex wrote:
> On Wednesday, 7 November 2018 at 14:07:32 UTC, 9il wrote:
>> This is a regression. It is fixed in mir-random v2.1.2.
>
> Thanks. But I have another one:
>
> ´´´
> import mir.random.algorithm;
> import std.experimental.all;
>
> void main()
> {
> 	S[] arr;
> 	arr.length = 42;
> 	arr.each!((i, ref el) => el.i = i);
> 	auto res = rne.sample(arr.map!((ref el) => el.i), 1);
> }
>
> struct S { size_t i; }
> ´´´
>
> Does not depend, on whether I use (ref el) or just el... And should not depend on that ;)

I have updated template constraints.
http://docs.random.dlang.io/latest/mir_random_algorithm.html#.sample

The problem that looks like Phobos map does not define all required primitives like popFrontExactly. I suggest using Mir instead of Phobos if possible:


https://run.dlang.io/is/NBTfwF

/+dub.sdl:
dependency "mir-algorithm" version="~>3.0.3"
dependency "mir-random" version="~>2.1.1"
+/

import mir.random.algorithm;
import mir.algorithm.iteration;
import mir.ndslice: sliced, iota, map, member;

void main()
{
	S[] arr;
	arr.length = 42;
    // using each
	arr.length.iota.each!((i, ref el) => el.i = i)(arr);

    // or using each and member
    arr.length.iota.each!"b = a"(arr.member!"i");

    // or using assign
    arr.member!"i"[] = arr.length.iota;

	auto res0 = rne.sample(arr.map!((ref el) => el.i), 1);
    // or using member
	auto res1 = rne.sample(arr.member!"i", 1);

}

struct S { size_t i; }

On Wednesday, 7 November 2018 at 17:05:31 UTC, 9il wrote:
> I have updated template constraints.
> http://docs.random.dlang.io/latest/mir_random_algorithm.html#.sample
>
> The problem that looks like Phobos map does not define all required primitives like popFrontExactly.

Ok... didn't have this on my radar.

> I suggest using Mir instead of Phobos if possible:
>
>
> https://run.dlang.io/is/NBTfwF
>
> /+dub.sdl:
> dependency "mir-algorithm" version="~>3.0.3"
> dependency "mir-random" version="~>2.1.1"
> +/
>
> import mir.random.algorithm;
> import mir.algorithm.iteration;
> import mir.ndslice: sliced, iota, map, member;
>
> void main()
> {
> 	S[] arr;
> 	arr.length = 42;
>     // using each
> 	arr.length.iota.each!((i, ref el) => el.i = i)(arr);
>
>     // or using each and member
>     arr.length.iota.each!"b = a"(arr.member!"i");
>
>     // or using assign
>     arr.member!"i"[] = arr.length.iota;
>
> 	auto res0 = rne.sample(arr.map!((ref el) => el.i), 1);
>     // or using member
> 	auto res1 = rne.sample(arr.member!"i", 1);
>
> }
>
> struct S { size_t i; }

I will try to adopt this... Thanks a lot!

Ok... sorry for being penetrant, but there is still something strange. Having dependencies as you had,

´´´
import mir.random.algorithm;
import mir.algorithm.iteration;
import mir.ndslice;
import mir.random;

void fun(size_t s){}

void main()
{
	size_t[] arr;
	arr.length = 42;

	rne.sample(arr, 1).each!(el => fun(el));
	foreach(i; rne.sample(arr, 1)) { i.fun; }
}
´´´

I get

/Users/alex/.dub/packages/mir-random-2.1.2/mir-random/source/mir/random/algorithm.d(573,48): Error: no property front for type ulong[]
/Users/alex/.dub/packages/mir-algorithm-3.0.3/mir-algorithm/source/mir/algorithm/iteration.d-mixin-922(922,5): Error: template instance `mir.random.algorithm.RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]).RandomSample.front!()` error instantiating
/Users/alex/.dub/packages/mir-algorithm-3.0.3/mir-algorithm/source/mir/algorithm/iteration.d(966,25):        instantiated from here: eachImpl!(__lambda1, RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU,18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]))
source/app.d(13,20):        instantiated from here: each!(RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]))
dmd failed with exit code 1.

If I import in mir.random.algorithm.d (2.1.2) in line 534 std.range, the error goes away. But I assume, that's not the way it should be solved, is it?

On 07.11.2018 22:09, Alex wrote:
> Ok... sorry for being penetrant, but there is still something strange. Having dependencies as you had,
> 
> ´´´
> import mir.random.algorithm;
> import mir.algorithm.iteration;
> import mir.ndslice;
> import mir.random;
> 
> void fun(size_t s){}
> 
> void main()
> {
>      size_t[] arr;
>      arr.length = 42;
> 
>      rne.sample(arr, 1).each!(el => fun(el));
>      foreach(i; rne.sample(arr, 1)) { i.fun; }
> }
> ´´´
> 
> I get
> 
> /Users/alex/.dub/packages/mir-random-2.1.2/mir-random/source/mir/random/algorithm.d(573,48): Error: no property front for type ulong[]
> /Users/alex/.dub/packages/mir-algorithm-3.0.3/mir-algorithm/source/mir/algorithm/iteration.d-mixin-922(922,5): Error: template instance `mir.random.algorithm.RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]).RandomSample.front!()` error instantiating
> /Users/alex/.dub/packages/mir-algorithm-3.0.3/mir-algorithm/source/mir/algorithm/iteration.d(966,25):        instantiated from here: eachImpl!(__lambda1, RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU,18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]))
> source/app.d(13,20):        instantiated from here: each!(RandomSample!(MersenneTwisterEngine!(ulong, 64LU, 312LU, 156LU, 31LU, 13043109905998158313LU, 29LU, 6148914691236517205LU, 17LU, 8202884508482404352LU, 37LU, 18444473444759240704LU, 43LU, 6364136223846793005LU), ulong[]))
> dmd failed with exit code 1.
> 
> If I import in mir.random.algorithm.d (2.1.2) in line 534 std.range, the error goes away. But I assume, that's not the way it should be solved, is it?
It's not a full answer, but try to add `import std.array;` or its analog in mir if exists

On Wednesday, 7 November 2018 at 19:09:50 UTC, Alex wrote:
> Ok... sorry for being penetrant, but there is still something strange. Having dependencies as you had,
>
> [...]

Well, fixed in v2.1.3

On Wednesday, 7 November 2018 at 19:40:57 UTC, 9il wrote:
> On Wednesday, 7 November 2018 at 19:09:50 UTC, Alex wrote:
>> Ok... sorry for being penetrant, but there is still something strange. Having dependencies as you had,
>>
>> [...]
>
> Well, fixed in v2.1.3

Thanks again!
Works for now.