Re: nested reduce/reduce-kv idiom
Thanks John,
I came up with this, which uses destructuring quite heavily and might
slow things down...
(reduce (fn [s [t1 t2 w3 v]] (assoc-in s [t1 t2 w3] (/ (count v) all))) {}
(for [[k1 v1] ems [k2 v2] v1 [k3 v3] v2] [k1 k2 k3 v3]))
is this what you meant?
Jim
On 03/04/13 19:54, John D. Hume wrote:
Destructure the map entry.
(for [[k vs] some-map, v vs] v) or whatever.
On Wed, Apr 3, 2013 at 1:44 PM, Jim - FooBar(); jimpil1...@gmail.com wrote:
Hi all,
I 've recently come across this idiom (instead of nested reduces - from
Christophe's blog post of course!)
(reduce f init (for [x xs, y x, z y] z)) ;;it took me a while to realise how
cool this is :)
I'm trying to do the same for reduce-kv (for nested maps) but doesn't quite
work...has anyone done this already? It comes down to 'seq' returning a
[k,v] vector when called on a map so the second nesting level will break
because it will find a keyword or something similar. any ideas?
Jim
--
--
You received this message because you are subscribed to the Google
Groups Clojure group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
Clojure group.
To unsubscribe from this group and stop receiving emails from it, send an
email to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
--
--
You received this message because you are subscribed to the Google
Groups Clojure group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups Clojure group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
Re: nested reduce/reduce-kv idiom
On Apr 4, 2013 6:54 AM, Jim - FooBar(); jimpil1...@gmail.com wrote:
Thanks John,
I came up with this, which uses destructuring quite heavily and might
slow things down...
(reduce (fn [s [t1 t2 w3 v]] (assoc-in s [t1 t2 w3] (/ (count v) all))) {}
(for [[k1 v1] ems [k2 v2] v1 [k3 v3] v2] [k1 k2 k3 v3]))
is this what you meant?
Yes, something like that.
--
--
You received this message because you are subscribed to the Google
Groups Clojure group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
Clojure group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
nested reduce/reduce-kv idiom
Hi all, I 've recently come across this idiom (instead of nested reduces - from Christophe's blog post of course!) (reducef init (for[x xs, y x, z y] z)) ;;it took me a while to realise how cool this is :) I'm trying to do the same for reduce-kv (for nested maps) but doesn't quite work...has anyone done this already? It comes down to 'seq' returning a [k,v] vector when called on a map so the second nesting level will break because it will find a keyword or something similar. any ideas? Jim -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: nested reduce/reduce-kv idiom
Destructure the map entry. (for [[k vs] some-map, v vs] v) or whatever. On Wed, Apr 3, 2013 at 1:44 PM, Jim - FooBar(); jimpil1...@gmail.com wrote: Hi all, I 've recently come across this idiom (instead of nested reduces - from Christophe's blog post of course!) (reduce f init (for [x xs, y x, z y] z)) ;;it took me a while to realise how cool this is :) I'm trying to do the same for reduce-kv (for nested maps) but doesn't quite work...has anyone done this already? It comes down to 'seq' returning a [k,v] vector when called on a map so the second nesting level will break because it will find a keyword or something similar. any ideas? Jim -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- http://elhumidor.blogspot.com/ -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
