Question

I have a vector v

(def v [1 2 5 8 4 3 8 9 3])

I want to apply function myfn

(defn myfn [x] (+ 1 x))

to selected items that I have their indexes idx

(def idx [3 5])

I’ve seen How do I modify a portion of a vector in Clojure? and it is not exactly what I need.

Like what you do in MATLAB

v = [1 2 5 8 9 3];
idx = [3 5];
v(idx) = myfn(v(idx));

Answer 1

Vectors in clojure are associative, so you can do something like this: (reduce #(update-in %1 [%2] myfn) v idx)