[plt-scheme] coroutine versus stream

Sorry Jos but it's not worth buying this kind of document (I wouldn't  
recommend buying my dissertation either). Go to the closest  
university library (cs) and ask whether they can't get a copy for  
you. It may take some time but it's your best bet. Also, Carolyn's  
treatment is formal, i.e., she develops a framework for proving  
equivalences. (She likes baroque notation, btw.) If you're interested  
in the ideas only, she has pointers to even earlier suggestions on  
how coroutines and streams relate -- Matthias





On Apr 19, 2009, at 5:25 AM, Jos Koot wrote:

> Thanks,
> I have no account on that site, but I posted a question whether or  
> not they do serve private persons too.
> As I am retired I have no access via an official institute.
> Thanks, again, Jos
>
> ----- Original Message ----- From: "Robby Findler"  
> <robby at eecs.northwestern.edu>
> To: "Jim Bender" <benderjg2 at aol.com>
> Cc: "Jos Koot" <jos.koot at telefonica.net>; <plt- 
> scheme at list.cs.brown.edu>; "Matthias Felleisen" <matthias at ccs.neu.edu>
> Sent: Sunday, April 19, 2009 2:26 AM
> Subject: Re: [plt-scheme] coroutine versus stream
>
>
> It looks like you can buy a copy here:
>
> http://proquest.umi.com/pqdlink?did=752257391&Fmt=7&clientId
> =79356&RQT=309&VName=PQD
>
> and if you are at a university you can probably get it via  
> interlibrary loan.
>
> Robby
>
> On Sat, Apr 18, 2009 at 5:23 PM, Jim Bender <benderjg2 at aol.com> wrote:
>> I believe the reference is to Carolyn Talcott's dissertation "The  
>> essence of
>> Rum: A theory of intensional and extensional aspects of Lisp-type
>> computation". Stanford, 1986. Unfortunately this is not available  
>> online, as
>> far as I know.
>> Jim
>>
>> Sent from my iPhone
>> On Apr 18, 2009, at 4:54 PM, "Jos Koot" <jos.koot at telefonica.net>  
>> wrote:
>>
>> Thanks, Matthias,
>> I did a quick search for Talcott 1986, but got so many hits  
>> relevevant info
>> is hidden like a leaf on a sound tree.
>> Can you be more specific? Thanks
>> Jos
>>
>> ----- Original Message -----
>> From: Matthias Felleisen
>> To: Jos Koot
>> Cc: plt-scheme at list.cs.brown.edu
>> Sent: Saturday, April 18, 2009 11:43 PM
>> Subject: Re: [plt-scheme] coroutine versus stream
>>
>> It is indeed a well-known fact that streams and coroutines are two  
>> sides of
>> the same coin. Talcott's 1986 dissertation is the earliest  
>> theoretical
>> treatment that I know. -- Matthias
>>
>>
>> On Apr 18, 2009, at 5:38 PM, Jos Koot wrote:
>>
>> It seems to me that in many cases the same problem can be solved  
>> (for an
>> eager evaluater) both by coroutines and by streams. Both solutions  
>> very well
>> show the structure of the principal algorithm as might have been  
>> written
>> with a lazy evaluator in mind. Which approach would be preferred  
>> in terms of
>> efficiency (time and memory). May be you would like to address  
>> other aspects
>> as well. One reason that makes me tend to choose streams, is that  
>> the latter
>> seem better suited to automatic code generation from purely lazy  
>> code.
>> Thanks, Jos
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>