Re: [vim/vim] add rand(), srand() (#1277)

[Charles E Campbell]

Yegappan Lakshmanan wrote:
>
>> Mines.vim, which generates a minefield, does so using a pseudo-random
>> number generator (which comes with it, btw, since I wrote that in vim).
>>
> I leveraged your pseudo-random number generator for the battleship
> game Vim plugin. (https://github.com/yegappan/battleship).
>
> - Yegappan
>
Thank you, Yegappan, for telling me!
Chip

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Re: [vim/vim] add rand(), srand() (#1277)

[Yegappan Lakshmanan]

Hi,

On Thu, Jun 15, 2017 at 1:00 PM, Charles E Campbell
 wrote:
> Bram Moolenaar wrote:
>>
>> Yasuhiro Matsumoto wrote:
>>
>> > This add Xorshift random generator. In general implementation, srand()
>> > may be called from some plugins in several times. So it need to have
>> > statefull random generator like Xorshift. Below is an usage of
>> > srand().
>> >
>> > ```vim
>> > :echo srand()
>> > [123456789, 362436069, 521288629, 88675123]
>> > :echo srand(-1)
>> > [1479837050,, 362436069, 521288629, 88675123]
>> > :echo srand(2)
>> > [2, 362436069, 521288629, 88675123]
>> > ```
>> > srand return four numbers as list. When expr is not given, the x
>> element of xorshift become 123456789. When negative number is given, x
>> become time(NULL). When positive number is given, x become it given.
>> >
>> > Below is an usage of rand()
>> >
>> > ```vim
>> > let a = srand()
>> > :echo rand(a)
>> > 597902826
>> > :echo rand(a)
>> > 458295558
>> > :echo rand(a)
>> > 1779455562
>> > :echo rand(a)
>> > 663552176
>> > :echo rand(a)
>> > 507026878
>> > ```
>>
>> What plugin needs a pseudo-random number generator?
> Mines.vim, which generates a minefield, does so using a pseudo-random
> number generator (which comes with it, btw, since I wrote that in vim).
>

I leveraged your pseudo-random number generator for the battleship
game Vim plugin. (https://github.com/yegappan/battleship).

- Yegappan

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Re: [vim/vim] add rand(), srand() (#1277)

[Charles E Campbell]

Bram Moolenaar wrote:
>
> Yasuhiro Matsumoto wrote:
>
> > This add Xorshift random generator. In general implementation, srand()
> > may be called from some plugins in several times. So it need to have
> > statefull random generator like Xorshift. Below is an usage of
> > srand().
> >
> > ```vim
> > :echo srand()
> > [123456789, 362436069, 521288629, 88675123]
> > :echo srand(-1)
> > [1479837050,, 362436069, 521288629, 88675123]
> > :echo srand(2)
> > [2, 362436069, 521288629, 88675123]
> > ```
> > srand return four numbers as list. When expr is not given, the x
> element of xorshift become 123456789. When negative number is given, x
> become time(NULL). When positive number is given, x become it given.
> >
> > Below is an usage of rand()
> >
> > ```vim
> > let a = srand()
> > :echo rand(a)
> > 597902826
> > :echo rand(a)
> > 458295558
> > :echo rand(a)
> > 1779455562
> > :echo rand(a)
> > 663552176
> > :echo rand(a)
> > 507026878
> > ```
>
> What plugin needs a pseudo-random number generator?
Mines.vim, which generates a minefield, does so using a pseudo-random
number generator (which comes with it, btw, since I wrote that in vim).

Regards,
Chip Campbell

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