[Microbit-Python] Micropython random numbers

[David Whale]

Most games start from a button press, that has an indeterminate user
initiated start time.

But the noise bits from the accelerometer are just as good.

This is a DAL issue though.

D.

Sent from my new HTC
On Nov 25, 2015 8:25 PM, "Mark Shannon" <mark at hotpy.org> wrote:

>
>
> On 25/11/15 14:40, David Whale wrote:
>
>> There is indeed microbit.random()
>>
>>
>> Note that there is some evidence of a bug in the runtime random function
>> at the moment when I use it from Touch Develop, it's not very random,
>> because it is not seeded (I think).
>>
>> My Dr Who Daleks game always shoots me on the first two goes, because
>> the random number sequence is, I think, the same every time.
>>
>> It would be good if the first time random() was called it seeded it with
>> the running_time variable so that it was automatically randomized.
>>
> Except that running_time is initialized to 0 at start up, so you will
> still predictable values.
>
> I would suggest getting seed bits from the accelerometer.
> >>> a.get_x() ^ a.get_y() ^ a.get_z()
> should do the job.
>
> Cheers,
> Mark.
>
>
>> David.
>>
>> ___________________________________________________________
>> David Whale, B.Sc (Hons), MIET
>> *Software Engineer and IET Schools Liaison Officer, Essex*
>>
>> email: dwhale at theiet.org <mailto:dwhale at theiet.org>
>> twitter: @whaleygeek
>> blog: blog.whaleygeek.co.uk <http://blog.whaleygeek.co.uk>
>>
>> Co-author of the new book "Adventures in Minecraft"
>> <http://amzn.to/ZGfxZG> - lets get kids coding!
>>
>>
>> On 25 November 2015 at 14:15, Damien George <damien.p.george at gmail.com
>> <mailto:damien.p.george at gmail.com>> wrote:
>>
>>     There is a microbit.random() function.
>>
>>     On Wed, Nov 25, 2015 at 2:10 PM, Michael <sparks.m at gmail.com
>>     <mailto:sparks.m at gmail.com>> wrote:
>>      > Check one of the sensors to see which one is changing lots, and
>>     take some
>>      > digits from that?
>>      >
>>      > (If you're shaking it and take values from the accelerometer with
>>     pauses
>>      > between from the compass you'll probably get values as random as
>>     shaking a
>>      > dice :-) )
>>      >
>>      >
>>      > Michael.
>>      >
>>      > On 25 November 2015 at 13:50, Martin O'Hanlon
>>     <martin at ohanlonweb.com <mailto:martin at ohanlonweb.com>> wrote:
>>      >>
>>      >> A microbit is on its way to me...  I've got an idea but it would
>>     be really
>>      >> useful to be able to create a random number, the equivalent of
>>      >> random.randint(0,5).
>>      >>
>>      >> From a quick look through Micropython's docs I dont think a random
>>      >> function is available.
>>      >>
>>      >> Has anyone got any inspired thoughts about how I might create a
>>     'pseudo
>>      >> random number' using micropython.
>>      >>
>>      >> Mart
>>      >>
>>      >>
>>      >> --
>>      >>
>>      >> Blog - www.stuffaboutcode.com <http://www.stuffaboutcode.com>
>>      >>
>>      >> Twitter - @martinohanlon
>>      >>
>>      >>
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