Re: [racket-users] Matrix Indexing Operations in "math/matrix"
Sorry for the confusing wording. Basically, All I want is to be able to do G[ row ][ col ] = value In Racket. I've been messing with Racket this afternoon and have an engine that is able to index into matrices, and just implemented several common matrix operations, such as transpose, matrix multiplication, etc..., so for now, I'm good. On Saturday, October 6, 2018 at 8:47:41 PM UTC-7, cwebber wrote: > > Ricardo Iglesias writes: > > > Good afternoon. I'm trying to move away from things like Matlab and > SciPy > > to do linear algebra work. > > Something I notice I do a lot is indexing operations, such as > > MATRIX[ row ] [ column ] > > > > I'm looking at the "math/matrix" library provided here: > > https://docs.racket-lang.org/math/matrices.html, and don't see anything > of > > this sort; I only see things like > > (matrix-map-rows) > > > > and > > (matrix-map-cols) > > > > Being able to access and modify a particular entry in the matrix would > be > > very useful in specifying operations to matrices. For example, given a > > matrix *G*, one might want to perform indexing operations to get the > matrix > > attached. > > > > Is this possible with the math/matrix library? > > > > Additionally, would there be a way to implement a version of > > matrix-map-row/cols that uses an index? > > Not quite what you're asking, but someone at RacketCon suggested to me > that maybe we should get GNU Scientific Library bindings added to > Racket, so we can better compete with Python and R for scientific / > statistical work... > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Matrix Indexing Operations in "math/matrix"
Ricardo Iglesias writes: > Good afternoon. I'm trying to move away from things like Matlab and SciPy > to do linear algebra work. > Something I notice I do a lot is indexing operations, such as > MATRIX[ row ] [ column ] > > I'm looking at the "math/matrix" library provided here: > https://docs.racket-lang.org/math/matrices.html, and don't see anything of > this sort; I only see things like > (matrix-map-rows) > > and > (matrix-map-cols) > > Being able to access and modify a particular entry in the matrix would be > very useful in specifying operations to matrices. For example, given a > matrix *G*, one might want to perform indexing operations to get the matrix > attached. > > Is this possible with the math/matrix library? > > Additionally, would there be a way to implement a version of > matrix-map-row/cols that uses an index? Not quite what you're asking, but someone at RacketCon suggested to me that maybe we should get GNU Scientific Library bindings added to Racket, so we can better compete with Python and R for scientific / statistical work... -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Making evaluators / handin server setup
At Wed, 26 Sep 2018 15:57:12 -0700, Jordan Johnson wrote: > > (require racket/sandbox) > > (make-evaluator "beginner-lang.rkt") > . . ../../../../../../../../Applications/Racket > v7.0/collects/racket/private/kw-file.rkt:102:2: open-input-file: `read' > access > denied for /Users/jteach/Library/Racket/7.0/pkgs/.LOCKpkgs.rktd That was a problem with creating a sandbox in DrRacket, as opposed to `racket` at the command line or with the handin server. It's fixed for the next release. > In doing a trial run of submitting my test solutions, I found my checker.rkt > signaling errors from the check: form: Using :language '(special > htdp-beginner), I get an error from the student’s (require 2htdp/image) line, > saying that image? is being imported twice. Long story short, this appears to be a bug in the sandbox evaluator setup, too, also fixed for the next release. A workaround is to use `'lang/htdp-beginner` as the language instead of `'(special beginner)`. That happens to avoid a redundant and troublemaking `require`. Roughly, the problem was that with `'(special beginner)` or `'(lib "lang/htdp-beginner.rkt")` the sandbox constructs a module that uses the language --- but also `require`s the language. That redundancy is a problem if there are bindings that other `require`s are intended to shadow, such as `image?` shadowed by requiring `2htdp/image`. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Matrix Indexing Operations in "math/matrix"
Good afternoon. I'm trying to move away from things like Matlab and SciPy to do linear algebra work. Something I notice I do a lot is indexing operations, such as MATRIX[ row ] [ column ] I'm looking at the "math/matrix" library provided here: https://docs.racket-lang.org/math/matrices.html, and don't see anything of this sort; I only see things like (matrix-map-rows) and (matrix-map-cols) Being able to access and modify a particular entry in the matrix would be very useful in specifying operations to matrices. For example, given a matrix *G*, one might want to perform indexing operations to get the matrix attached. Is this possible with the math/matrix library? Additionally, would there be a way to implement a version of matrix-map-row/cols that uses an index? -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Scribble warnings in package documentation
Are you still seeing this problem? It looks like multiple problems,
possibly these:
- `@defmodule[appy]` appearing in multiple sections
This one might be fixed by putting it once at a section that
encloses others, or maybe by using `#:link-target? #f` on all
but once of them.
- function definitions in sections that are not within one that has
`@defmodule[appy]`
This one might also be fixed by moving `@defmodule[appy]` to an
enclosing section, or maybe by just using
`@declare-exporting[appy]`.
- Multiple sections titled "Overview".
This would be fixed by adding a `#:tag` to one or more of them to
make them distinct.
At Wed, 26 Sep 2018 16:09:56 +0100, Erich Rast wrote:
> I have a long package documentation and get lots of warnings - see
> below. Other than that, the docs work fine, should/can I ignore them?
>
> What do they mean anyway?
>
> Best,
>
> Erich
>
> WARNING: collected information for key multiple times: '(exporting-libraries
> #f); values: '(appy/gui) '(appy)
> WARNING: collected information for key multiple times: '(exporting-packages
> #f); values: '("appy") '("appy")
> WARNING: collected information for key multiple times: '(exporting-libraries
> #f); values: '(appy/storage-interface) '(appy/storage)
> WARNING: collected information for key multiple times: '(exporting-packages
> #f); values: '("appy") '("appy")
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: no declared exporting libraries for definition
> WARNING: collected information for key multiple times: '(index-entry (part
> "Overview")); values: (list '("Overview") (list (element #f '("Overview")))
> (part-index-desc)) (list '("Overview") (list (element #f '("Overview")))
> (part-index-desc))
> WARNING: collected information for key multiple times: '(part "Overview");
> values: '#(("Overview") (part "Overview") (1) (collects #"appy"
> #"scribblings"
> #"manual.html") #f) '#(("Overview") (part "Overview") (1 4 2) (collects
> #"appy" #"scribblings" #"manual.html") #f)
>
> --
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Re: [racket-users] raco config-path
There's not currently a way to set that path dynamically. I'm not sure what it would mean to call a Racket function to set that value, since the configuration path is used to read the initial settings of various parameters, such as `current-library-collection-paths`, that are needed to boot Racket. I think maybe you don't want to set `--config-path`, but you want to instead want to store preferences in a different and separately configured path. But I may misunderstand. At Tue, 25 Sep 2018 11:45:01 -0700 (PDT), Lehi Toskin wrote: > In the docs for raco exe, there exists a switch `--config-path` that you > can specify to tell the executable to look in this directory for a config > file. Is there a way to set this as a runtime path instead? When OS X runs > my test program, it'll have Cmd-, set as the default shortcut for opening > the preferences which appears to use the default "etc" directory, but I > don't yet see a way to make the path be set to any user's .config (or maybe > XDG) directory. > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Places code not using all the CPU
On 10/5/2018 10:32 AM, Matthew Flatt wrote: At Fri, 5 Oct 2018 15:36:04 +0200, Paulo Matos wrote: > Again, I am really surprised that you mention that places are not > separate processes. Documentation does say they are separate racket > virtual machines, how is this accomplished if not by using separate > processes? Each place is an OS thread within the Racket process. The virtual machine is essentially instantiated once in each thread, where things that look like global variables at the C level are actually thread-local variables to make them place-specific. Still, there is some sharing among the threads. > My workers are really doing Z3 style work - number crushing and lots of > searching. No IO (writing to disk) or communication so I would expect > them to really max out all CPUs. My best guess is that it's memory-allocation bottlenecks, probably at the point of using mmap() and mprotect(). Maybe things don't scale well beyond the 4-core machines that I use. On my machines, the enclosed program can max out CPU use with system time being a small fraction. It scales ok from 1 to 4 places (i.e., real time increased only some). The machine's core are hyperthreaded, and the example maxes out CPU utilization at 8 --- but it takes twice as long in real time, so the hardware threads don't help much in this case. Running two processes with 4 places takes about the same real time as running one process with 8 places, as does 2 processes with 2 places. Do you see similar effects, or does this little example stop scaling before the number of processes matches the number of cores? As Matthew said, this may be a case where multiple processes are better. One thing that likely is vastly different between your two systems is the memory architecture. On Paulo's many-core machine, each group of [probably] 6 CPUs will have its own physical bank of memory which is close to it and which it uses preferentially. Access to a different bank may be very costly. Paulo's machine may be spending a much greater percentage of time moving data between VM instances that are located in different memory regions ... something Matthew can't see on his quad-core. Paulo, you might take a look at how memory is being allocated [not sure what tools you have for this] and see what happens if you restrict the process to running on various groups of CPUs. It may be that some banks of your memory are "closer" than others. Hope this helps, George -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
