Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

> On Nov 10, 2015, at 3:13 AM, Daniel Brunner wrote: > > Hi, > > has anybody done some "Internet of Things" stuff with Racket? I am > looking for some applications which use e.g. MQTT[*] either as a broker > or client and I couldn't find anything on the internet or in the

Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

Hi Daniel, I have the start of an MQTT client laying around, but it's pretty ugly. It was basically me poking around and exploring the protocol. https://github.com/concurrency/plumb2/blob/master/mqtt.rkt https://github.com/concurrency/plumb2/blob/master/mqttest.rkt It's lying in the middle of a

Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

> > Just built a monitoring system for a solar house using a server written in > Racket. No MQTT, though, we just used plain old HTTP request-based messaging, > and it worked fine. Yeah, that was my first attempt as well. I have written it in Common Lisp several months ago. For teaching

Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

Hey Matt, thanks for the hint; I am going to have a look into your files. At the moment it's mainly for teaching purposes. Best wishes, Daniel Am 10.11.2015 um 17:37 schrieb Matt Jadud: > Hi Daniel, > > I have the start of an MQTT client laying around, but it's pretty > ugly. It was basically

Re: [racket-users] Interpolating Polynomial in Newton Form

Use Horner's rule. /Jens Axel 2015-11-06 22:27 GMT+01:00 Dave Yrueta : > Hi All — > > Given a list of constants (a0, a1… an) and a list of x-values (x0, > x1,….xn), I want to write a function in Racket that produces the function > p(x) = a0 + a1(x - x0) + a2(x - x0)(x - x1)

Re: [racket-users] Feasibility of Racket for scientific and engineering calculations

A few useful resources: Matrices http://docs.racket-lang.org/math/matrices.html?q=matrix GNU Scientific Library http://planet.racket-lang.org/package-source/wmfarr/mzgsl.plt/3/0/planet-docs/mzgsl/index.html Science Collection

Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

Going briefly off-topic for Racket... Definitely be encouraged to experiment in the "IoT" network-connected device space, as hobbyists, DIYers, or researchers. But be very careful with big IoT investments. Also be skeptical of current off-the-shelf IoT products and specs, for security- or

[racket-users] Correct use of pattern-expander (example in docs is broken)

The docs (http://docs.racket-lang.org/syntax/stxparse-patterns.html#%28def._%28%28lib._syntax%2Fparse..rkt%29._pattern-expander%29%29) give an example, ~maybe, that doesn't actually work: > (define-syntax ~maybe (pattern-expander (syntax-rules () [(~maybe pat ...)

[racket-users] unstable/gui/slideshow - tabular

I’m preparing a slideshow for this weekend, and I had been using unstable/gui/slideshow to get tabular. My Racket couldn’t find it, so I rebuilt from source, and I still can’t find it. Am I looking in the wrong place, is it gone, should I be using something else? Geoff -- You received this

Re: [racket-users] unstable/gui/slideshow - tabular

The `unstable-lib` package, which provides `unstable/gui/slideshow` is not included in the main distribution anymore. It needs to be installed explicitly: raco pkg install unstable Vincent On Tue, 10 Nov 2015 17:46:29 -0600, Geoffrey S. Knauth wrote: > > I’m preparing a slideshow for this

Re: [racket-users] unstable/gui/slideshow - tabular

Thank you Vincent, that worked, and my presentation runs again as before. Thank you also Sam for your suggestion (raco pkg install unstable-lib), which I just saw but did not try because I was already running again. Geoff > On Nov 10, 2015, at 21:25 , Vincent St-Amour

Re: [racket-users] Anybody done some "Internet of Things" stuff with Racket?

I'm currently experimenting with Tony's racket/stomp package that you might want to check out, too. The idea is to provide more generic messaging services for liitin.org project, not just IoT but also between people, software services, cloud computing and such. Initial target is an

Re: [racket-users] Correct use of pattern-expander (example in docs is broken)

Oh, oops. I hadn't realized that syntax-rules using syntax-protect could cause problems. This works though: (define-syntax ~maybe (pattern-expander (lambda (stx) (syntax-case stx () [(~maybe pat ...) #'(~optional (~seq pat ...))] I'll open a pull request to fix

Re: [racket-users] Feasibility of Racket for scientific and engineering calculations

Those are great resources! Thanks! Jens Axel Søgaard writes: > A few useful resources: > > Matrices > http://docs.racket-lang.org/math/matrices.html?q=matrix > > GNU Scientific Library > > http://planet.racket-lang.org/package-source/wmfarr/mzgsl.plt/3/0/planet-docs/mzgsl/index.html > >

Re: [racket-users] Correct use of pattern-expander (example in docs is broken)

Ok, I just opened https://github.com/racket/racket/pull/1133, which fixes this so that syntax-rules still works. > On Nov 10, 2015, at 6:19 PM, Alex Knauth wrote: > > Oh, oops. I hadn't realized that syntax-rules using syntax-protect could > cause problems. > > This