a different identifier in the for().
On Friday, June 14, 2019 at 12:46:54 PM UTC-4, David Storrs wrote:
>
>
>
> On Fri, Jun 14, 2019 at 10:45 AM Sanjeev Sharma > wrote:
>
>> within this for loop is there any way to access different pieces of the
>> description and amt? c
cat is from srfi/54
On Friday, June 14, 2019 at 10:45:10 AM UTC-4, Sanjeev Sharma wrote:
>
> within this for loop is there any way to access different pieces of the
> description and amt? car-ing and cdr-ing for example?
>
> Or move the identifier definitions into the let*,
within this for loop is there any way to access different pieces of the
description and amt? car-ing and cdr-ing for example?
Or move the identifier definitions into the let*, and pass those to for in
some way?
(let*((ratio 9/12))
(for((description(list "this" "that"))
(amt(list
I believe "you won't believe ..." tests out better (higher click through)
in scientific advertising circles than "I can't believe ..." .
On Thursday, April 25, 2019 at 4:06:41 PM UTC-4, Jay McCarthy wrote:
>
> (ninth RacketCon) on July 13th, 2019
>
> Speakers Announced!
>
>
WHOPS ... SRFI/54
On Friday, March 15, 2019 at 1:57:03 PM UTC-4, sdgu...@gmail.com wrote:
>
> Hi all,
>
> I've been looking through the docs for a way to print decimals to a
> defined precision.
>
> I can get close to what I want using something like ~a and giving it a set
> width without
SRFI 57, the function cat
differs from ~r in several areas, but looks like a decent alternative
On Friday, March 15, 2019 at 1:57:03 PM UTC-4, sdgu...@gmail.com wrote:
>
> Hi all,
>
> I've been looking through the docs for a way to print decimals to a
> defined precision.
>
> I can get close
I'm getting much faster startup times.
And the initial freeze when loading a file after initial startup - is that
actually faster or has it been amortized using lazy techniques?
On Monday, November 19, 2018 at 6:35:43 PM UTC-5, Matthew Butterick wrote:
>
>
> > On Nov 19, 2018, at 2:06 PM,
Hope you get many more accolades.
Your work keeps me curious & engaged intellectually long after I left
programming partly due to lack of curiosity among my colleagues and my own
lack of curiosity with the methods available to me.
On Wednesday, September 26, 2018 at 6:53:34 PM UTC-4,
I didn't realize (though I should have) that the comment could be taken
that way.
I realize you were not writing anything about the Turing language, but the
title of the essay triggered some memories for me of what my classmates and
later my professional colleagues used to talk about. And
"Turing is useless" ...
While I worked as a programmer I used to complain quite bitterly about
university comp sci departments that had NIH (not invented here) syndrome
and a captive audience.
I learned Turing as my 2nd programming language. I'm sure the only reason
it could have been
the specific case I had in mind was near this
(let ([unless? odd?])
(for/sum ([x '(1 2 3 4 5)]
#:unless (uless? x))
x)) ;6
but as long as one is defaulting #:unless
PLUS #unless is common to all the for's across some arbitrary scope,
ideally one could
I haven't done this in a while & the config / build from
src/cs/c/
using racket 7 source with built packages failed this morning.
Are the READMEs still up to date?
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, gneuner2 wrote:
>
>
> On 8/2/2018 7:45 PM, Sanjeev Sharma wrote:
> > can racket's #: keywords be finagled / coerced into a parameterizable
> > form?
>
> ???
>
> Certainly you can pass a parameter to a keyword argument, and/or make a
> parameter the default v
can racket's #: keywords be finagled / coerced into a parameterizable
form?
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SRFI 54 - ever need a 4-character "thousands" separator? Bharat has units
called lakhs & crores, instead of thousands
I think there was a numberphile episode on it. French, Dutch, Babylonian,
Indian ...
Just one of the things I needed recently; I've used a bunch of SRFI 54
features over
my animated-canvas%
>>>> package, which is still on planet. I've also attached a gif of it. [I had
>>>> never used the animated gif routines in Racket before, but they were pretty
>>>> easy to use.] I've also attached an an animation of one of the 3D plots
>>
what. the. heck.
is going on here?
On Monday, March 26, 2018 at 10:49:45 AM UTC-4, m.douglas.williams wrote:
>
> And, I made a gif of the animated 3D plot.
>
>
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, March 23, 2018 at 5:17:03 PM UTC-4, Sanjeev Sharma wrote:
>
> I've done no math in 20 years - used to do tons (with the not so great
> graphics of the time) saw this intriguing plot & banged my head against a
> wall for a couple of hours.
>
> Then I just settled
, Sanjeev Sharma wrote:
>
> I've done no math in 20 years - used to do tons (with the not so great
> graphics of the time) saw this intriguing plot & banged my head against a
> wall for a couple of hours.
>
> Then I just settled down & read the manual systematically, pret
I've done no math in 20 years - used to do tons (with the not so great
graphics of the time) saw this intriguing plot & banged my head against a
wall for a couple of hours.
Then I just settled down & read the manual systematically, pretending it
may have some info, followed the examples and
Is there a self-contained nightly build without the installer which sets
defaults and icons and shortcuts?
I'd like to test out the nightly builds but they occasionally step over the
stable version.
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sigh ... meant to get this part into the reply (from the same paper)
The original version of the loop macro consists of 1840 lines of
code, not counting comments and empty lines. The implementation
of the loop keyword macros takes 387 lines; the rest includes the
implementation of its various
hirty-one CPS macros [Hilsdale and Friedman 2000] for loop
> clauses such as for and do.
>
> CPS macros pose challenges for generating good erro
So it looks like Ryan Culpepper has a racket version? I didn't see anything
obvious on his github account.
On Friday, July 21, 2017 at 6:32:43 A
anyone have a working implemntation?
Just a little while ago I read something to the effect that Shivers thought
error handling would be a huge mess but there's a Racket implementation that
does a lot of error handling cheaply.
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addenda are becoming a habit with me ... a vague memory stirs.
Was there an article discouraging the use of these bindings and giving good
reasons for doing so a long time ago?
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The issue is with marking a region at s-expr boundary (start or end)
I start the marking (C-space) and move forward (C-f or right arrow) and the
region is marked as I expect, whether I cross an s-expr boundary or not.
and some results I didn't expect
I start the marking (C-space) and move
f threading with a more powerful binding form, though if you
> can come up with a syntax that accomplishes what you’re getting at, I’d
> certainly at least be interested by it.
>
> > On Jun 25, 2017, at 09:44, Sanjeev Sharma wrote:
> >
> > is there a way to do a calculation in
'() for the parameter
For the usual (no ) function call It's not an issue for the standard
car/cdr idiom of walking down recursive structures.
On Wednesday, September 7, 2016 at 9:28:23 AM UTC-4, Jon Zeppieri wrote:
> On Wed, Sep 7, 2016 at 8:33 AM, Sanjeev Sharma <thro...@gmail.com&
Thanks for joining in.
The amended question had nothing to do with the earlier example
I'm wondering if there's a quick, standard (and easily understood) idiom
(without an internal helper function) to recur on the variable argument list y
The flatten's not ideal - I may want to retain some
sday, September 6, 2016 at 7:39:59 AM UTC-4, gneuner2 wrote:
> On Sun, 4 Sep 2016 10:36:21 -0700 (PDT), Sanjeev Sharma wrote:
>
> >two "x" 's also work
> >
> >(define list (lambda x x))
>
> (lambda x x x) works because the evaluation of the middle x is a side
&g
if anyone stumbles on this later this is also discussed in Kent Dybvig's TSPL4
http://www.scheme.com/tspl4/start.html#./start:h6
from section 2.6:
For example, the definitions of cadr and list might be written as follows.
(define (cadr x)
(car (cdr x)))
(define (list . x) x)
--
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merci & danker -
I had just done same-parity exercise using this but did not see the equivalence
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two "x" 's also work
(define list (lambda x x))
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For more options,
is there a define syntax equivalent to this lambda
(define list (lambda x x x))
(list 1 2 3 4 5 "a")
;returns
;'(1 2 3 4 5 "a")
I wanted to write subsets from SICP without
passing the parameter as a list, and a simiar
version of average
(define nil '())
(define (subsets s)
(if (null? s)
very cool
let-values is does what I need
On Thursday, August 18, 2016 at 1:50:18 PM UTC-4, Jens Axel Søgaard wrote:
> No, (list (values 1 2 3)) is not supposed to work.
> Multiple values can be cumbersome to work with.
> In this case you want:
>
>
> (call-with-values (λ () (values 1 2 3))
(list(values 1 2 3))
result arity mismatch;
expected number of values not received
expected: 1
received: 3
values...:
I've been under the impression this should be identical to
(list 1 2 3)
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thanks folks - marked completed but please share more if there are more
I was going to use hilite.me but I prefer having something resembling the
racket documents
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is there a quick & dirty way to use scribble or the drracket GUI to generate
html for random code snippets?
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how can I get lists of identifiers im/exported when one uses
all-defined-out
all-from-out
I can't yet make sense of regprov.rkt
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thanks
same versions - I was trying to see the effects of different gcc optimization
flags, especially with Pict3D some math.
On Saturday, August 1, 2015 at 10:35:55 PM UTC-4, Matthew Flatt wrote:
Are you seeing conflicts with different installations that have the
same version number? Or
I am getting conflicts between the global install and in-place installs,
especially in document searches not working.
I'm guessing the issue is with user preferences.
Is there a way to do the in-place install such that everything gets put in the
in-place install's tree?
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windows 7; it's most obvious in
preferences - warnings
also choose language - details
I can ivoke and reverse it from this screen:
Control Panel\Appearance and Personalization\Display
- make text and other items larger or smaller
- medium
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