I changed from one OS to another and I was missing a simple feature:
automatic password generation. To fill the gap with a Scheme I
implemented such a generator as a command line tool respectively /crypto
sweet/.
After having read /SRFI 27: Sources of Random Bits/ I decided to
implement my
On 19/06/2015 21:24, Luke Miles wrote:
Say I have a list ls and I want to produce a list of
lists where the i'th list has the i'th element of ls tripled,
but all other elements are the same.
e.g. '(3 5 7) = '((9 5 7) (3 15 7) (3 5 21))
What is a fast way to do this?
I could do a loop with
On 22/06/2015 11:05, George Neuner wrote:
Hi all,
I have what I hope is a quick question. WIth appropriate care to pair
start and commit/rollback, is it safe to use call-with-transaction
and start-transaction together?
e.g.,
(call-with-transaction dbc
(lambda ()
:
On 10/06/2015 12:33, Michael Titke wrote:
I changed from one OS to another and I was missing a simple feature:
automatic password generation. To fill the gap with a Scheme I
implemented such a generator as a command line tool respectively
/crypto sweet/.
After having read /SRFI 27: Sources
On 12/06/2015 13:21, Konrad Hinsen wrote:
On 12/06/15 09:15, Michael Titke wrote:
In my understanding the pseudo random number generator is deterministic.
That means for the same input seed /random/ will always return the same
value. This is why one usually has to set a new state for each
On 05/07/2015 01:00, Neil Van Dyke wrote:
Matthew Flatt wrote on 07/04/2015 06:40 PM:
That is, unlike so many other things in our infrastructure, the GC is
not so tangled with everything else that it would be difficult to
change by itself. Granted,
Good about GC not so tangled.
I don't know
Some high water mark on the stack might be another improvement - it
would only need to scan above it for changes - but on a second thought:
that wouldn't work or change wouldn't mean anything anymore because of
the Lazy Sweep.
Have you ever seen such a thing segfault after exactly 9000 cells
On 02/07/2015 21:36, Greg Davidson wrote:
Is there interest in creating a Gnu Emacs Lisp Racket Language, along with the
underlying APIs (perhaps tied to DrRacket) sufficient to compile and run Gnu
Emacs Lisp extension packages? Is there prior or ongoing work for such a
project?
For some
On 02/08/2015 19:12, Konstantin Weitz wrote:
I'm trying to write a distributed racket program using [places][0]. From my
current understanding, this means that I have to send data to each place over a
channel using the `place-channel-put` function, which can send any value
accepted by
As the mentioned SRFI states it:
This is a proposal to allow procedure calls that evaluate to the value
of a location to be used to /set/ the value of the location, when used
as the first operand of |set!|.
The term location is only used in the introductory part but for those
who know the
In the forgotten theory /fold/ should reduce its arguments like in the
following examples:
(define (apply-or well-formed-list)
(foldl {lambda (a b) (or a b)}
#f
well-formed-list))
(define (apply-and well-formed-list)
(foldl {lambda (a b) (and a b)}
#t
On 01/08/2015 18:29, Ian Tegebo wrote:
On Wednesday, July 29, 2015 at 8:17:06 AM UTC-7, Michael Titke wrote:
(define (apply-or well-formed-list)
(foldl {lambda (a b) (or a b)}
#f
well-formed-list))
(define (apply-and well-formed-list
I don't know why but at some point in the 20th century people really
became afraid of viewing programs as pure data (which they are) and
started to call it metacircular (which of course also refers to other
properties of a list processor treating each and every start of list,
i.e. opening
On 04/08/2015 16:34, Alexis King wrote:
And that, I think, is the problem: eval seems a lot like a “one size fits all”
approach to problem solving.
...
We write in high-level languages for a reason. There’s no reason to stunt their
ability to abstract by directly calling eval.
I do
On 03/08/2015 07:22, Neil Van Dyke wrote:
Michael Titke wrote on 08/03/2015 12:50 AM:
Perhaps /quote/ and /eval/ would do the job? That is the usual way to
treat Scheme code as data and data as Scheme code.
Eval might indeed be the perfect solution this time, iff every other
conceivable
I always suspected this to be a logical joke of forcing people to write
their own quantifiers and to not let them fall for predicate logic.
The best thing about a logic scheme declaring everything but really
everything to be true when it is not false are expressions like the
following:
(when
Last time I checked FrTime (and Reactive Programming in general) it
seemed to me like a specialized application of constrained based
programming. There is a run-time part and while some applications of the
concept in other programming languages (such as C#) offer only some
syntactic forms to
On 07/08/2015 22:43, Alexander D. Knauth wrote:
On Aug 7, 2015, at 12:27 PM, Michael Titke michael.tied...@o2online.de wrote:
I always suspected this to be a logical joke of forcing people to write their
own quantifiers and to not let them fall for predicate logic.
The best thing about
These procedure were necessary to represent questions like IS THERE ANY
stack on the table onto which I could put this card?, Is the top card
of ALL foundations a king?. If so then you have won! :-)
I think they call these quantifiers and these tend to be used as
descriptive ones,
On 25/07/2015 14:02, Hendrik Boom wrote:
On Sat, Jul 25, 2015 at 12:04:07AM +, John Carmack wrote:
Half-life was written in C on my Quake 1 codebase.
Thank you for the correction. Now I get to wonder what the truth
behind the rumour was. Evidently not half-life.
-- hendrik
There is
On 03/09/2015 16:29, Linh Chi Nguyen wrote:
Dear All,
I'm a complete newbie in racket and need help in coding finite state
machine/automata. Please pardon any of my ignorance.
Thanks to this post of Tim Thornton, I see a very good way to code FSM:
I have written a little card game Open Flowers which needed about the
same amount of memory.
My guess is that amount of memory is just the "fuel memory" the engine
needs from one garbage collection cycle to the next. Traditional
mark stop-the-world garbage collection seems to come to an end
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