I (require errortrace) in the REPL, but it seems to only apply to the specific module associated with the REPL window. Is there a way to apply errortrace across multiple modules?
As an expedient I consolidated two files into one for debugging, but perhaps there’s a better way. In general, how do people debug Racket code? On Oct 13, 2014, at 9:50 AM, [email protected] wrote: > Send users mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.racket-lang.org/users/listinfo > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of users digest..." > > > [Racket Users list: > http://lists.racket-lang.org/users ] > > > Today's Topics: > > 1. Re: problems with the term 'symbol' (Bryan Coutts) > 2. Re: problems with the term 'symbol' (Bryan Coutts) > 3. Re: flood-fill? (Pierpaolo Bernardi) > 4. Re: flood-fill? (Jens Axel S?gaard) > 5. Re: problems with the term 'symbol' (Matthias Felleisen) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 13 Oct 2014 12:00:23 -0400 > From: Bryan Coutts <[email protected]> > To: Christian Wagenknecht <[email protected]> > Cc: [email protected] > Subject: Re: [racket] problems with the term 'symbol' > Message-ID: > <CAAwFm8O4ase5NntYhr=jrj41n24FhGN-gmaUTuC+J6i=etl...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Since ' expands to quote, '#(1 xyz) is really just shorthand for (quote (1 > xyz)). Note that quote recursively quotes its arguments; for the same > reason that '(a b) is a list that contains the *symbols* 'a and 'b, '#(1 > xyz) is a vector that contains 1 and the symbol 'xyz. > > On Mon, Oct 13, 2014 at 11:53 AM, Christian Wagenknecht < > [email protected]> wrote: > >> With regard of Racket's symbols I have a problem with the consistency of >> the terminology as follows. >> A symbol in Scheme and maybe in earlier Racket versions is considered as >> an identifier. For example xyz is a symbol, whereas 'xyz avoids the >> evaluation of xyz. >> >> In current version the little ' (normally as shorthand for quote) belongs >> to the symbol. For example 'xyz is a symbol. A symbol is obviously >> considered as a quoted identifier, at least syntactically. >> >> However, when using a symbol as part of an expression the prepending ' >> disappears. For example: (vector 1 'xyz), consisting of a number and a >> symbol evaluates to '#(1 xyz). But xyz is not a symbol but an identifier. >> Therefore to say that this vector belongs of a number and a symbol is no >> longer valid. (vector-ref '#(1 xyz) 1) returns 'xyz, which is correct, >> however, this is also visually a difference where there is none. >> >> Could you help me to get it right, please? >> >> >> ____________________ >> Racket Users list: >> http://lists.racket-lang.org/users >> >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.racket-lang.org/users/archive/attachments/20141013/697ec012/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Mon, 13 Oct 2014 12:04:33 -0400 > From: Bryan Coutts <[email protected]> > To: Christian Wagenknecht <[email protected]> > Cc: [email protected] > Subject: Re: [racket] problems with the term 'symbol' > Message-ID: > <caawfm8ovju1eufxbw6p-btcn4tkehhpxnxrg0w+frf8sd+_...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Er, that should read " '#(1 xyz) is really just shorthand for (quote #(1 > xyz)) > > On Mon, Oct 13, 2014 at 12:00 PM, Bryan Coutts <[email protected]> > wrote: > >> Since ' expands to quote, '#(1 xyz) is really just shorthand for (quote (1 >> xyz)). Note that quote recursively quotes its arguments; for the same >> reason that '(a b) is a list that contains the *symbols* 'a and 'b, '#(1 >> xyz) is a vector that contains 1 and the symbol 'xyz. >> >> On Mon, Oct 13, 2014 at 11:53 AM, Christian Wagenknecht < >> [email protected]> wrote: >> >>> With regard of Racket's symbols I have a problem with the consistency of >>> the terminology as follows. >>> A symbol in Scheme and maybe in earlier Racket versions is considered as >>> an identifier. For example xyz is a symbol, whereas 'xyz avoids the >>> evaluation of xyz. >>> >>> In current version the little ' (normally as shorthand for quote) belongs >>> to the symbol. For example 'xyz is a symbol. A symbol is obviously >>> considered as a quoted identifier, at least syntactically. >>> >>> However, when using a symbol as part of an expression the prepending ' >>> disappears. For example: (vector 1 'xyz), consisting of a number and a >>> symbol evaluates to '#(1 xyz). But xyz is not a symbol but an identifier. >>> Therefore to say that this vector belongs of a number and a symbol is no >>> longer valid. (vector-ref '#(1 xyz) 1) returns 'xyz, which is correct, >>> however, this is also visually a difference where there is none. >>> >>> Could you help me to get it right, please? >>> >>> >>> ____________________ >>> Racket Users list: >>> http://lists.racket-lang.org/users >>> >>> >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.racket-lang.org/users/archive/attachments/20141013/1ab03166/attachment-0001.html> > > ------------------------------ > > Message: 3 > Date: Mon, 13 Oct 2014 18:30:05 +0200 > From: Pierpaolo Bernardi <[email protected]> > To: Vincent St-Amour <[email protected]> > Cc: Jens Axel S?gaard <[email protected]>, users > <[email protected]> > Subject: Re: [racket] flood-fill? > Message-ID: > <cany8u7hnzpoltszij9bzyfxqgi52zdzt46qwyxehxugaeph...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > On Mon, Oct 13, 2014 at 5:15 PM, Vincent St-Amour <[email protected]> > wrote: >> Is it in the package catalog? > > My version it's not. The one I modified is available from > https://github.com/acmeism/RosettaCodeData/blob/master/Task/Bitmap-Flood-fill/Racket/bitmap-flood-fill.rkt > and I don't know its status. > > BTW, Matthias reviewed my queue module and offered useful suggestions. > I'm attaching the improved version here. > > Matthias: this one includes all your suggestions, including growing > the store by vector fiddling. > Thank you for prodding me. :) > > And here's two examples of what I'm using the code for (still lot of > work to do): > > https://farm6.staticflickr.com/5599/15337830979_c4bccae56a_o.png > https://farm4.staticflickr.com/3940/15337812549_5ec924e207_o.png > > P. > > >> At Sat, 11 Oct 2014 20:59:09 +0200, >> Pierpaolo Bernardi wrote: >>> >>> For the record, in case someone else needs a flood-fill, attached >>> below there's what I ended up using. > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: simple-queue.rkt > Type: application/octet-stream > Size: 3546 bytes > Desc: not available > URL: > <http://lists.racket-lang.org/users/archive/attachments/20141013/2a9d83c2/attachment-0001.obj> > > ------------------------------ > > Message: 4 > Date: Mon, 13 Oct 2014 18:34:23 +0200 > From: Jens Axel S?gaard <[email protected]> > To: Pierpaolo Bernardi <[email protected]> > Cc: users <[email protected]> > Subject: Re: [racket] flood-fill? > Message-ID: > <CABefVgwqQYZyQw+qyUtLbYzR6f=3xhmu0p7jr2zqtuf0tyc...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > 2014-10-13 18:30 GMT+02:00 Pierpaolo Bernardi <[email protected]>: >> My version it's not. The one I modified is available from >> https://github.com/acmeism/RosettaCodeData/blob/master/Task/Bitmap-Flood-fill/Racket/bitmap-flood-fill.rkt >> and I don't know its status. > > The flood fill example at Rosetta Code: > > http://rosettacode.org/wiki/Bitmap/Flood_fill#Racket > > Rosetta is a Wiki, so it ought to be possible to see who wrote the > code from the history > of the page. > > /Jens Axel > > > ------------------------------ > > Message: 5 > Date: Mon, 13 Oct 2014 12:55:18 -0400 > From: Matthias Felleisen <[email protected]> > To: Christian Wagenknecht <[email protected]> > Cc: [email protected] > Subject: Re: [racket] problems with the term 'symbol' > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > > On Oct 13, 2014, at 11:53 AM, Christian Wagenknecht <[email protected]> > wrote: > >> With regard of Racket's symbols I have a problem with the consistency of the >> terminology as follows. >> A symbol in Scheme and maybe in earlier Racket versions is considered as an >> identifier. For example xyz is a symbol, whereas 'xyz avoids the evaluation >> of xyz. >> >> In current version the little ' (normally as shorthand for quote) belongs to >> the symbol. For example 'xyz is a symbol. A symbol is obviously considered >> as a quoted identifier, at least syntactically. >> >> However, when using a symbol as part of an expression the prepending ' >> disappears. For example: (vector 1 'xyz), consisting of a number and a >> symbol evaluates to '#(1 xyz). But xyz is not a symbol but an identifier. >> Therefore to say that this vector belongs of a number and a symbol is no >> longer valid. (vector-ref '#(1 xyz) 1) returns 'xyz, which is correct, >> however, this is also visually a difference where there is none. >> >> Could you help me to get it right, please? > > > You need to distinguish to what an evaluation evaluates (a value) and how the > value prints. These are separate concerns and the Lisp/Scheme community > suffered from a conflation for decades; Brian Smith's treatise on 2Lisp and > 3Lisp was the worst form of this suffering. > > -- Matthias > > > > > End of users Digest, Vol 110, Issue 44 > ************************************** ____________________ Racket Users list: http://lists.racket-lang.org/users
