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<
zipper >
Does racket support destructuring or pattern matching?
09:18
ym555_ is now known as ym555
09:20
<
zipper >
Destrcuturing?
09:20
<
zipper >
e.g I want to get the first and second element of a pair
09:20
<
zipper >
without using car and cdr
09:20
<
ym555 >
match-let and match-define
09:22
<
ym555 >
(match-define (cons x y) (cons 10 20)))
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09:30
<
zipper >
Thanks ym555
09:32
<
zipper >
You sure match-define exists though?
09:34
<
zipper >
Ah it's from racket/match
09:35
<
zipper >
I get that both are undefined give me amin
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<
zipper >
Yeah I hadn't imported racket/match
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<
andreabedini >
Hi all, I am trying to compile racket (the C version, not the ChezScheme one) for iOS (../configure --host=x86_64-apple-darwin --enable-ios=iPhoneSimulator --enable-racket=racket
10:57
<
andreabedini >
), but I get `free identifier found in linklet in: single-flonum-available?` any ideas?
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<
samth >
andreabedini: my guess is that you are pointing at an existing racket with `--enable-racket` that isn't new enough
13:47
<
samth >
can you try it without that option?
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13:49
<
andreabedini >
@samth: thanks for the hint, I'm not sure what --enable-racket does, I have just followed the instructions on the README.md, I'll definitely try without. That said, further investigation seems to show that the iOS build was working as of commit db67701 on 27 Mar
13:50
<
andreabedini >
perhaps something broke after that commit
13:50
<
andreabedini >
I'm trying to build v7.3 at the moment
13:51
<
samth >
`--enable-racket`uses an existing racket installation for bootstrapping
13:51
<
samth >
instead of building twice
13:52
<
andreabedini >
TIL, thanks! that seems relevant. Existing racket is v7.3 official release
14:02
<
samth >
andreabedini: yes, that would explain the error since `single-flonum-available?` is not in 7.3
14:05
<
andreabedini >
I can confirm 7.3 builds ok for iOS
14:06
<
bremner >
ccccccfriblgcunjftljvfvfhbjlvefkufrencbunthh
14:06
<
bremner >
argh. sorry.
14:06
<
ecraven >
new keyboard? :P
14:06
<
bremner >
new yubikey, which thinks it's a keyboard
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14:06
<
ecraven >
ah, now we know all your keys!
14:06
<
ecraven >
or is that not how this works :P
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<
bremner >
uh. well, supposedly not.
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<
jcowan >
Aren't single-floats being removed from Racket anyway, or is that just temporary?
15:49
<
jcowan >
(IMAO single-float arrays are all you really need)
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16:48
<
eeanon >
is it appropriate to ask language questions here?
16:49
<
bremner >
if the language is racket, then sure
16:49
<
eeanon >
so I have a question, is there a simple way to print in scientific notation?
16:50
* jcowan
would like to know that too
16:50
<
eeanon >
i.e. print 100000 as 1e+6
16:52
<
eeanon >
for example, in other languages i can do something like (sprintf "%.2e" x)
16:53
<
bremner >
rudybot: (exact->inexact 100000)
16:53
<
rudybot >
bremner: ; Value: 100000.0
16:57
<
eeanon >
thanks anyway
16:58
<
bremner >
rudybot: doc ~r
16:59
<
eeanon >
oh that seem to solve my problem
17:00
<
eeanon >
thanks a lot
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