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Adding element to nested vector


Adding element to nested vector

By : Camosnide
Date : November 21 2020, 03:00 PM
I wish this help you i don't know how to get this done, maybe somebody could help me? I'd like to make something like this: , I would write something like this:
code :
(defn foo [num-reads size]
  (loop [i num-reads, r (vec (repeat size []))]
    (if (zero? i) 
      r
      (let [[u v] (repeatedly read)]
        (recur (dec i), (-> r (update u conj v) (update v conj u)))))))


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Taking reference to vector element before adding more element to vector

Taking reference to vector element before adding more element to vector


By : Skurmey
Date : March 29 2020, 07:55 AM
will help you The act of modifying the container is not prohibited just because you acquired an iterator, reference, or pointer by some means. It is the iterator, reference, or pointer itself that is potentially invalidated.
§23.3.6.6 [vector.modifiers] (includes the push_back member family)
R: increase value of element in vector 'a' by adding the value from another vector 'b' to the previous element in vector

R: increase value of element in vector 'a' by adding the value from another vector 'b' to the previous element in vector


By : francois xavier
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I have data for a time relevant response. The data is grouped by factors though the timestamp is not such that instead of having start time at 0ms for factor a, the start time is more like 1901ms and end time is 2801ms. Factor b then picks up where factor a ends and so forth. I subsetted the data by factor and calculated the difference between each data collected row for that group. , You will need to use cumsum:
code :
> difference_vector <- c(5,2,1,6)
> timestamp <- c(0, cumsum(difference_vector))
> timestamp
[1]  0  5  7  8 14
re-frame: adding a new map element in nested vector

re-frame: adding a new map element in nested vector


By : user1915304
Date : March 29 2020, 07:55 AM
it should still fix some issue You do it just like in plain clojure, using update-in. First start at the Clojure CheatSheet:
http://jafingerhut.github.io/cheatsheet/clojuredocs/cheatsheet-tiptip-cdocs-summary.html
code :
(def db {:questions [
           {:33 {:question "one", :id 33,
                 :answers  [{:id 22, :question_id 33, :answer "one", :correct false}
                            {:id  4, :question_id 33, :answer "two", :correct false}]}},
           {:39 {:question "two", :id 39, :answers []}},
           {:41 {:question "three", :id 41,
                 :answers  [{:id 29, :question_id 41, :answer "one", :correct false}
                            {:id 35, :question_id 41, :answer "two", :correct true}]}}]})
(def new-answer {:id 42, :question_id 442, :answer "The Ultimate", :correct false})
  (let [submap       (get-in db [:questions 0 :33 :answers])
        modified     (conj submap new-answer)
        final-answer (update-in db [:questions 0 :33 :answers] conj new-answer)   ]
submap => 
[{:id 22, :question_id 33, :answer "one", :correct false}
 {:id  4, :question_id 33, :answer "two", :correct false}]
modified => 
[{:id 22, :question_id  33, :answer "one", :correct false}
 {:id  4, :question_id  33, :answer "two", :correct false}
 {:id 42, :question_id 442, :answer "The Ultimate", :correct false}]
final-answer => 
{:questions
 [{:33
   {:question "one",
    :id 33,
    :answers
    [{:id 22, :question_id  33, :answer "one", :correct false}
     {:id  4, :question_id  33, :answer "two", :correct false}
     {:id 42, :question_id 442, :answer "The Ultimate", :correct false}]}}
  {:39 {:question "two", :id 39, :answers []}}
  {:41
   {:question "three",
    :id 41,
    :answers
    [{:id 29, :question_id 41, :answer "one", :correct false}
     {:id 35, :question_id 41, :answer "two", :correct true}]}}]}
Passing a vector by const rerefence and adding an element to the vector

Passing a vector by const rerefence and adding an element to the vector


By : user2543373
Date : March 29 2020, 07:55 AM
wish helps you You assign m_days a copy of days. It is not the same vector and if m_days is not const (which it obviously is not since you just assigned to it) then adding elements to it is just fine. Nothing you do to m_days affects days in any way.
How do I Split a vector to equal length with the left over adding up from the first element(s) of parent vector with R

How do I Split a vector to equal length with the left over adding up from the first element(s) of parent vector with R


By : king3288
Date : March 29 2020, 07:55 AM
wish of those help I want R to split a vector to subvector of equal length but if the last subvector is not equal to the length of other subvectors to add it up with the first element(s) of the parent vector.
code :
#Extend the `ts` to have a total length of `bs * nb`
split(rep(ts, length.out = nb * bs), rep(1:nb, each = bs))
#OR use modular arithmetic
split(ts[((sequence(nb * bs) - 1) %% length(ts)) + 1], rep(1:nb, each = bs))
#$`1`
#[1] 1 2 3

#$`2`
#[1] 4 5 6

#$`3`
#[1] 7 8 9

#$`4`
#[1] 10 11  1
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