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Topic: Feedback in Turing Machines
Replies: 17   Last Post: May 29, 2013 12:36 AM

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David Bernier

Posts: 3,396
Registered: 12/13/04
Re: Feedback in Turing Machines
Posted: May 27, 2013 2:11 AM
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On 05/27/2013 01:37 AM, Graham Cooper wrote:
> On May 27, 2:32 pm, William Elliot <ma...@panix.com> wrote:
>> On Sun, 26 May 2013, apoorv wrote:
>>> On May 27, 8:13 am, William Elliot <ma...@panix.com> wrote:
>>>> On Sat, 25 May 2013, apoorv wrote:
>>>>> Is there some study on situation where the output from a TM at time T is
>>>>> fed back so that the total input at time T+1 is some function of output
>>>>> at time T and external input at time T+1.?

>>
>>>> So imput is on the right and out on the left and when done at time t, move
>>>> the output to the right of the tape and start again.

>>
>>>> Time t+1 begins the new output from the old output. You get to wait until
>>>> time t2 for the full second output.

>>
>>> The external input and the output have to be combined
>>> So the second TM is necessary?

>>
>> Input 1 on the right side, gives output 1 on the left side.
>> When done, imput 1 is erased and output 1 copied to the right side
>> where it's now imput 2. Imput 2 is used by the same machine
>> to produce output 2 on the left side.

>
> Starting left and finishing right is just a convention.
>
>
> n=1
> TMn - Start left, finish left, signal halt.
> n++
> repeat
>
>
> Seems there is never an output.
>
>
> Herc
> --
> www.phpPROLOG.com
>


Turing "founded" ``International Tape Machines" ( ITM ), but
he left no programmer's manual ...

As far as I know, the user interprets what the symbols
should mean. In practice, it's probably better
to work with "Blank" symbol, and maybe some
subset of printable ASCII symbols, though I don't
think people have seriously programmed Turing Tape
machines.

Usually, the input is thought of as all given
on the tape before running the machine.

dave


--
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