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Activity for NoahTheDuke
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #284926 |
I see now that my solution was already proposed by @hkotsubo, tho in a slightly roundabout way. I am still certain that it is a faster method than the nested loop with `divmod`. (more) |
— | over 2 years ago |
| Edit | Post #284926 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Python looping 300 000 rows I’m struggling to get `timeit` working correctly but this is faster in my limited tests: ```python l = [123456789, 23456789012, 34567890123] result = [0, 0, 0] for idx, row in enumerate(l): i = f"{row:011}" result[idx] = f"{i[:2]}-{i[2:4]}-{i[4:5]}-{i[5:8]}-{i[8:]}" print(result)... (more) |
— | over 2 years ago |
| Edit | Post #284900 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Add single element for multiple keys to map `(apply assoc m1 (interleave ks (repeat itm)))` Demonstration: ```clojure $ clj Clojure 1.10.3 user=> (def m1 {:a 1 :b 2}) #'user/m1 user=> (def itm 3) #'user/itm user=> (def ks [:c :d :e]) #'user/ks user=> (apply assoc m1 (interleave ks (repeat itm))) {:a 1, :b 2, :c 3, :d 3, :e 3} ``... (more) |
— | over 2 years ago |
| Edit | Post #284899 |
Post edited: Add clj command and Clojure version to repl output |
— | over 2 years ago |
| Edit | Post #284899 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Add single element for multiple keys to map `(merge m1 (zipmap ks (repeat itm)))` Demonstration: ```clojure $ clj Clojure 1.10.3 user=> (def m1 {:a 1 :b 2}) #'user/m1 user=> (def itm 3) #'user/itm user=> (def ks [:c :d :e]) #'user/ks user=> (merge m1 (zipmap ks (repeat itm))) {:a 1, :b 2, :c 3, :d 3, :e 3} ``` `repeat` retur... (more) |
— | over 2 years ago |
| Edit | Post #284898 | Initial revision | — | over 2 years ago |
| Question | — |
Add single element for multiple keys to map I have a map and a new item to add to the map and a list of keys I want to attach the new item to: ```clojure => m1 {:a 1 :b 2} => itm 3 => ks [:c :d :e] => m2 {:a 1 :b 2 :c 3 :d 3 :e 3} ``` I thought of using `reduce`, but that seems overly wordy. How best do I do this? (more) |
— | over 2 years ago |