On Wed, Jun 26, 2019 at 8:48 PM Chou Yan <yan.chou.str...@gmail.com> wrote:
>
> like this:
> r:=rand.New(rand.NewSource(time.Now().Unix()))
> for {
> r.Intn(96)
> }
> I know the same seed will generate the same sequence. But I don't know why it
> generate mass same number when I use seed of 'time.Now().Unix()', But when I
> use seed of 'time.Now().UnixNano()', It will not.
> I suspect what this is related to the seqence rand algorithm,But I have no
> relevant evidence
This doesn't make sense. Can you reproduce it in the go playground?
>
> 在 2019年6月27日星期四 UTC+8上午10:32:38，Burak Serdar写道：
>>
>> On Wed, Jun 26, 2019 at 8:17 PM Chou Yan <yan.ch...@gmail.com> wrote:
>> >
>> > I use:
>> > r:=rand.New(rand.NewSource(time.Now().Unix()))
>> > r..Intn(96)
>>
>> How are you generating multiple random numbers? If your loop that
>> generates these numbers include the r:=rand.New(...), then you're
>> essentially seeding the random number generator with the same number,
>> because the program ends before time.Now().Unix() returns a different
>> value every second.
>>
>> Move the r:=rand.New(...) outsite the for loop.
>>
>> > I got:
>> >
>> > and val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 39
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > rand val: 82
>> > ...
>> > mass common sequential number .
>> > But if I change that：
>> > r:=rand.New(rand.NewSource(time.Now().UnixNano()))
>> > It will not happen.
>> > Why does this happened? and how do I choose it between time.Now().Unix()
>> > or UnixNano()?
>> >
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>
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