https://images1.sw-cdn.net/model/picture/625x465_4125316_13307849_1449535750.jpg

(defn skeletonize-test-01 []
  (let [mesh (-> (cu/cuboid -5 10)
                 (op/seed->mesh))
        original-faces (:faces mesh)
        mesh (-> mesh
                 (op/skeletonize :thickness 5
                                 :get-f-factor (fn [{:keys [faces]} face]
                                                 (when (= face (last faces)) 0.5)))
                 (op/skeletonize :thickness 3
                                 :get-f-factor (fn [_ face]
                                                 (when (original-faces face) 0.25)))
                 (op/rep op/catmull-clark 4)
                 (g/tessellate)
                 (op/colorize))]
    mesh))

Because I can: https://images3.sw-cdn.net/model/picture/625x465_4125821_13308823_1449540847.jpg

Wow, nice

@meow: What lib are you using?

@kurtlazarus: thanks. I'm using http://thi.ng for the mesh datastructure and then my own mesh operators and X3D output from here: https://github.com/pkobrien/cad

I was using OpenSCAD for a while but am focusing on mesh manipulations for now.

You can get a better feel for that last model using the 3D tool here: https://www.shapeways.com/model/3dtools/4125821/1/26?key=bc7a8e9cd83b2179a5b9aff42e3ca96b

Hi. How do I install projects via maven? E.g. JDBC MySQL driver?

Nevermind, I just had to add [mysql/mysql-connector-java "5.1.6"] to my build.boot file (and no manipulations with maven)

Recently came across this book — Quantum Physics and the Philosophy of Alfred North Whitehead. Since I only became interested in Whitehead after seeing “Are we there yet?” figured some people on this list might also appreciate https://muse.jhu.edu/books/9780823250219

* Mechanics

someone a tip for this challenge : http://www.4clojure.com/problem/166

I understand that core.async/chan takes a transducer optionally, but is there a function to map over the values of a channel and transform them? or apply a transducer ex post facto?

txus: http://clojure.github.io/core.async/#clojure.core.async/map

hm I’ve tried map but I think I’m holding it wrong

admittedly I’m on ClojureScript. Should I ask there?

basically this code causes an error:

clojure
(let [ch (chan)]
  (go (>! ch 100)
      (close! ch))
  (go (println (<! (async/map inc ch)))))

Uncaught Error: [object Object] is not ISeqable

gonna bring it over to #C03S1L9DN. thanks!

map is deprecated

take a look at pipeline, pipeline-async

oh

I see that map<, map> etc are deprecated: https://clojure.github.io/core.async/#clojure.core.async/map

but not map :S

ah you're correct, sorry my mistake. The pipeline variants are mostly to do with doing things in parallel so maybe map is fine in your case.

there's only one error in your example (above)

(let [ch (async/chan)]
  (async/go (async/>! ch 100)
    (async/close! ch))
  (async/go (println (async/<! (async/map inc [ch])))))

async/map takes a collection of source channels, not just the one.

@hoopes: maybe you find this also useful https://github.com/funcool/octet

@txus: the map function receives a collection of channels instead of one channel

yeah, @d-t-w mentioned it… it’s probably just nitpicking but I’m surprised its signature is not variadic like clojure.core/map.

is there a reason for that?

I don't know but seems that clojure.core.async/map does not corresponds to the default map semantics

its doc says that it applies the function to the first value of each channel in the collection of channels that you can provide...

@niwinz yeah, i was looking at octet and buffy, but couldn't find a "takes a byte array, returns a map based on the spec" function (unless i'm blind)

0.0

this is just that octed does...

ha, all right then. i must have missed something awfully obvious - i'll keep working. thanks very much for the note!

(def spec (buf/spec :field1 (buf/int32)
                    :field2 (buf/int64)))
(buf/read buffer spec)
;; => {:field1 2 :field2 3}

buffer is the byte-array in that example?

buffer should be bytebuffer, and if you have byte array, you can create byte buffer from it just using (ByteBuffer/wrap yourbytearray)

awesome, thanks so much

You are welcome!

@hoopes: let see that part of the doc: http://funcool.github.io/octet/latest/#_read_and_write_data

it explaines the same thing that I have put in example 😄

yeah, i could see how to put data in as map/vector, and read it back out, but the byte-array part was the hurdle i couldn't clear - just getting started, so i really appreciate your help (if there's a different channel for the embarrassingly simple questions, i'll happily go there instead)

this is a funcool project so you can join in #C093UFM4M channel and ask any question about any funcool project 😉

async/map is deprecated, regular 'ol map you'll have to pry from my cold, dead, hands

I suspect this is going to be a stupid question but... I have a vector of maps` [{:yada "foo" :name "bar"} {:yada "foz" :name "baz"}]` and I'd like to dissoc :name from each map. Whats the best approach?

@crankyadmin: (map #(dissoc % :name) vecs)

@martinklepsch:

thanks I just got the exact something on the repl.

@crankyadmin: 👍 repl is always good to work out this kind of stuff

in clojure, if someone has placed there implementation inside of a`lib.impl` and is exposing it through lib, should the lib.impl namespace be treated as private?

lib.impl and lib are not related to each other, any more than any other namespaces would be.

So impl is just as related to lib as lib.impl is - which is to say not at all.

@derwolfe: I believe you are correct that it is a convention to treat the impl namespace as sort of a private matter, though Clojure doesn't enforce any privacy.

thank you

By convention (from Java libraries anyway) you know you are doing the wrong thing if you are making a call to a lib.impl function/method, but there is no actual way to make the namespace private.

in the future (Java 9) with modules, that may actually be possible. but that's a long, long way off for Clojure (if ever)

Here's a tip if you are relatively new to Clojure, like me. I do my "debugging" using (prn) statements and was wondering how I might do them inside some threading and came up with something that works. Here is an example:

(->> (d/value-set :f vertices v)
                             ((fn [x] (prn "Faces: " x) x))
                             (map fnormals)
                             ((fn [x] (prn "N-all: " x) x))
                             (set)
                             ((fn [x] (prn "N-set: " x) x))
                             (transduce identity g/+ v/V3)
                             (g/normalize)
                             ((fn [x] (prn "Fnorm: " x) x))
                             (d/index! norms))

So the trick is the ((fn [x] (prn "N-all: " x) x)) function

Anyone know if there is a way to simplify that or use a function literal thingie #() instead?

partial

@meow: I usually define a macro to do that.

(defmacro spy [x]
  `(let [x# ~x]
     (println '~x "=>" x#)
     x#))

@meow: i do the same, often just define a function for it

(partial prn “N-Set “)

(defn spy [name x]
  (prn name x) x)
...
(->> stuff
     (spy "test"))

@roberto: that won't return the value though

ohhhh, I see

It would be really useful to be able to send stuff to a gist...I wonder if theres an alfred workflow for that

@meow: The advantage of using a macro for spy is that you can print out the form rather than manually giving a name.

Also, a single argument function/macro is nice as it works with both -> and ->>.

@dmitrig01: Great suggestion, thanks.

@exupero: Ah, yes. I like that. Thanks.

@exupero: I made it a bit more vertical for my situation, and it works great. Much appreciated.

(defmacro spy [x]
  `(let [x# ~x]
     (println "<=" '~x "=>")
     (println x#)
     x#))

No problem.

I know this probably a dumb question, but do people keep ther eown little utils namespaces with these kind of tools?

if using leiningen, you can set a :dev profile

there's also user.clj

@rantingbob: yes, I have a namespace that's pretty much required in every other namespace for every project i've worked on

and I tend to copy-paste from flatland/useful but I refuse to depend on that entire project

it sucks, but we can't monkey-patch core in a modular way

@meow @exupero spy also exists in this handy toolkit of utils https://github.com/cloojure/tupelo

@simax99: I knew I had seen it somewhere long ago, but couldn’t find the repo. Thanks for digging it up for me.

@simax99: sweet

I've avoided depending on one of these grab-bag libraries but I may have to revisit that, or create my own, like @gtrak and others do

where you you save a namespace that is required in all your projects?

@meow @exupero No problem, it was mentioned on the clojure gazette (http://www.clojuregazette.com/) recently.

Hi, I'd like to execute a query on Hive h

via JDBC. But I need to set autoCommit to false. I think I wo

* grrrr safari is bad.... I think I want execute! but can't work out how to use it with autoCommit set to false.

You need to specify the :transaction false option, IIRC

That throws a java.lang.Boolean cannot be cast to java.lang.String exception.

(defn run-hive-query!
  [file-path message]
  (println message)
  (let [q  (string/split (slurp ( file-path))  #"\n")
        db  {:subprotocol "hive2"
             :classname "org.apache.hive.jdbc.HiveDriver"
             ;; :subname "//host:10000"
             :subname "//localhost:10000"
             :user “username”
             :password “password”}]
    (j/db-do-commands db :transaction? false q)))

The q needs to be a vector, doesn’t it?

I can’t recall the semantics of db-do-commands offhand tho, pretty sure I used execute!

doesn't split return a vector?

it should

donaldball: I'd say the set of things that truly need a vector is small enough that they are mostly either a) things that are specifically vector tools like subvec or b) mistakes that should have supported other sequential types

What’s the best way to have one or more example programs that exercise my library in my library’s project? Should they be full leiningen projects on their own?

I really wish there was a faster way to switch between active panels in Cursive...and a shortcut to jump to the repl window. I miss that from Sublime.

@rantingbob there’s a Cursive channel and @cfleming hangs out here. You can ask for that directly from him 😉

Oh....sweet

Sorry, I'm new to slack