Why am I getting an error here?

Im a little bit new to clojure myself, but using (nth vector2 %1) instead of (vector2 %1) fixes it

in dot-product function it is

also I think this is the better way to write it

(defn dot-product [vector1 vector2]
  (apply + (map #(* %1 %2) vector1 vector2))
  )

@sllyq: OK, thanks. Just a little confused about how apply works in Clojure… so used to JS apply

(apply func array) is equivalent to js func.apply(array) I think

or func(...array)

it should be func.apply(null, array) in first example

(apply + [1 2 3]) just basically makes it (+ 1 2 3)

ok, but i could also use reduce instead, right?

Yeah

It obiously does the same as your function, just threw it out there because it makes more sense to me this way. You can write whichever way you want it

@sllyq: Thanks for the insight!

OK, I’m a bit confused as to how to compare the results of 2 rounds of a loop

I used to do it like this

(loop [prev-val nil]
  (let [curr-val (+ 1 2)]
    (if (nil? prev-val)
      (recur curr-val)
      (compare-and-do-something-here))))

There might be a better way, not sure