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344 discussions

Test...
by Marco Antoniotti 29 Sep '19

29 Sep '19

Please ignore… -- Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://bimib.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY Please check: http://cdac2019.lakecomoschool.org Please check: http://troncopackage.org Please check: https://www.frontiersin.org/research-topics/7394/network-bioscience Please note that I am not checking my Spam-box anymore. Please do not forward this email without asking me first (cum grano salis).

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CDR Community on Zenodo.org
by Marco Antoniotti 13 Sep '19

13 Sep '19

Dear all I took the liberty to create a Zenodo Community for CDRs (https://zenodo.org/communities/cdr/). The main advantage of the Zenodo setup is that it assigns DOIs to he uploaded documents. In that way each CDR can also be cited in an unambiguous way across the Internet. If it is ok with all the submitters I will (slowly) upload the CDRs to the Zenodo Community with all the appropriate attributions. If you feel that something should not be uploaded or if you think there may be some problems with its uploading, do let me know. For the time being I will not upload the CLOS CDR as there may be some issue with it, although it is probably not that important anymore. Cheers MA -- Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://bimib.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY Please check: http://cdac2019.lakecomoschool.org Please check: http://troncopackage.org Please check: https://www.frontiersin.org/research-topics/7394/network-bioscience Please note that I am not checking my Spam-box anymore. Please do not forward this email without asking me first (cum grano salis).

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Test - please ignore
by Marco Antoniotti 12 Sep '19

12 Sep '19

Please ignore. sorry. Marco Antoniotti

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CL, NaNs and infinities.
by Marco Antoniotti 04 Sep '19

04 Sep '19

Hello, I am fooling around IEEE 754 (don't ask why) and I started asking questions to various CL impleentations about the usual corner cases. Take for example the function ACOS. prompt> (acos 42.0) #C(0.0 4.430675) Seems legit, according to CLHS. Now, suppose you do (e.g. in CCL) CCL prompt> (acos 1D++0) ; 1D++0 is positive infinity Error: FLOATING-POINT-INVALID-OPERATION detected performing * on (0.0D0 1D++0) While executing: CCL::%DOUBLE-FLOAT*-2!, in process Listener(4). Type cmd-. to abort, cmd-\ for a list of available restarts. Type :? for other options. 1 > SBCL prompt> (acos 1D++0) ; No, you can't write that in SBCL, but ber with me. arithmetic error FLOATING-POINT-INEXACT signalled [Condition of type FLOATING-POINT-INEXACT] Restarts: 0: [RETRY] Retry SLIME REPL evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [REMOVE-FD-HANDLER] Remove #<SB-IMPL::HANDLER INPUT on descriptor 8: #<CLOSURE (LABELS SWANK/SBCL::RUN :IN SWANK/BACKEND:ADD-FD-HANDLER) {12974D1D}>> 3: [ABORT] Exit debugger, returning to top level. LW prompt> (acos 1D++0) #C(6.283185307179586D0 1D+-0 #| 1D+-0 is double-float not-a-number |#) ACOS (and friends) also take complex numbers. CL-USER 19 > (acos #C( 42 42)) #C(0.785469 -4.7773905) Things get even more interesting when you pass to ACOS (and friends) a complex number with an infinity RE or IM part. LW prompt> (acos (complex 42 1D++0)) #C(1D+-0 #| 1D+-0 is double-float not-a-number |# -1D++0 #| -1D++0 is double-float minus-infinity |#) CCL prompt> (acos (complex 1.0 1D++0)) #C(1.5707963267948966D0 -1D++0) SCBL prompt> (acos (complex 1.0 1D++0)) arithmetic error FLOATING-POINT-INEXACT signalled [Condition of type FLOATING-POINT-INEXACT] Restarts: 0: [RETRY] Retry SLIME REPL evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [REMOVE-FD-HANDLER] Remove #<SB-IMPL::HANDLER INPUT on descriptor 8: #<CLOSURE (LABELS SWANK/SBCL::RUN :IN SWANK/BACKEND:ADD-FD-HANDLER) {12974D1D}>> 3: [ABORT] Exit debugger, returning to top level. Now, now, now. We do not like this state of affairs, do we? So, the question is: what should ACOS (and friends) do in these cases? What about the LIA ISO/IEC 10967 standards? All the best Marco -- Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://bimib.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY Please check: http://cdac2019.lakecomoschool.org Please check: http://troncopackage.org Please check: https://www.frontiersin.org/research-topics/7394/network-bioscience Please note that I am not checking my Spam-box anymore. Please do not forward this email without asking me first (cum grano salis).

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Test. Please ignore.
by Marco Antoniotti 02 Sep '19

02 Sep '19

Cheers — Marco

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FP infinities on CL
by Marco Antoniotti 31 Aug '19

31 Aug '19

Hi I just posted a longish thing on CLL regarding FP IEEE 754 infinities handling in CL. I invite you all to look at it and comment; unless you feel it is appropriate to re-post here. Thanks MA -- Marco Antoniotti, Associate Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://bimib.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY Please check: http://cdac2019.lakecomoschool.org Please check: http://troncopackage.org Please check: https://www.frontiersin.org/research-topics/7394/network-bioscience Please note that I am not checking my Spam-box anymore. Please do not forward this email without asking me first (cum grano salis).

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Fwd: Creating large arrays
by Burton Samograd 18 Jul '19

18 Jul '19

Hello, Someone on the LISP HUG Mailing list was recently trying to allocate a 4GB array and found that it was failing. I was recently thinking about such problems wishing there were sparse arrays in CL; I ended up making something called ’Spaces’ which potentially solve the problem. Below is a letter to HUG that I sent to someone outlining my solution to the problem. I thought some of you might find it useful as well, or might want to discuss this data structure, which I think is new, or at least I have never read nor heard of it before I invented it a couple of months ago. Burton > Begin forwarded message: > > From: Burton Samograd <busfactor1(a)icloud.com> > Subject: Re: Creating large arrays > Date: July 18, 2019 at 2:45:14 PM MDT > To: lisp(a)gmx.com > Cc: lisp-hug(a)lispworks.com > > >> Are there other fast-access data structures with no such limitations, on >> LispWorks? >> >> >> Thank you again, >> >> Priyadarshan > > I have created something called ’N-Dimensional Sparse Spaces’ as a solution to the large array allocation problem. > > > > > This initial implementation is one to replace a set of random points within an N-Dimensional Sparse Grid addressed using integers, hence the use of #’= in #’make-space. > > It is more generallized using other equals functions such as #’eql (so you can use symbols, and hence make an addressable symbol space), #’equals and #equalp letting you use S-Expressions as your addresses. > > I have a more general implementation somewhere in my code, but the above image is the code I initially wrote that can be springboarded off of to create your own implementation. > > One trick I have thought of is to, after you have completed your work with the space, is to compile it to a more suituable data structure for read-only access. > > The sparce space is for editing and loading of the data you want to work with. A complied space is for reading data from the space, giving up generality. > > Feel free to write me to discuss this data structure further if you have any questions or comments on its usefulness and generality and applicability to your problem. > > Burton Samograd > BusFactor1 Inc.

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reading s-expressions from a file
by Alexandre Rademaker 26 Jun '19

26 Jun '19

The “read” function makes really easy to read a bunch of s-expressions from a file, but how can I keep track of the line number where the expressions were in the file? Any ideia? Alexandre Sent from my iPhone

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Re: reading s-expressions from a file
by Jack Harper 26 Jun '19

26 Jun '19

Alexandre, be careful with Lisp control characters embedded - back quotes, commas etc. Jack Harper Secure Outcomes Inc Evergreen, Colorado USA At 10:27 AM 6/26/2019, LuÃs Oliveira wrote: >On Wed, Jun 26, 2019 at 5:19 PM Alexandre Rademaker ><arademaker(a)gmail.com> wrote: > > The âreadâ function makes really easy to > read a bunch of s-expressions from a file, but > how can I keep track of the line number where the expressions were in the file? > >One way to do it is to define a stream that keeps track of the current >line. Here's an example of such a stream: ><https://github.com/cl-stream/cl-stream/blob/master/line-tracking-stream.lisp>. > >-- >LuÃs Oliveira >http://kerno.org/~luis/ ---------------------------------------------------------------------------------- Jack Harper, President Secure Outcomes Inc 2942 Evergreen Parkway, Suite 300 Evergreen, Colorado 80439 USA 303.670.8375 303.670.3750 (fax) http://www.secureoutcomes.net for Product Info.

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Re: reading s-expressions from a file
by Jack Harper 26 Jun '19

26 Jun '19

1 0

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