On Fri, 30 Jul 2010 16:03:17 +0200, Base <basselh...@gmail.com> wrote:
Hi All
I have a vector in the following format:
[
["M" "3.4" "5.6"] ["L" "4.2" "6.6"] ["L" "4.9" "7.9"] ["L" "1.1"
"2.4"]["L" "5.4" "4.5"]
]
I would like to create a vector that contains the max values of each
of the second and third values from this vector
in this case it would be: [5.4, 7.9]
The method to do this that i have seen would be to
1. Transpose the vector using (apply map vector v)
2. Discard the vector of Ms and Ls
3 Cast all of the remaining numbers to Float
4 Apply Max to each of the vectors.
There *has* to be a more elegant way to do this than I have been
trying.
Any thoughts are appreciated as usual!
Base
****
(def v [["M" "3.4" "5.6"] ["L" "4.2" "6.6"] ["L" "4.9" "7.9"] ["L"
"1.1" "2.4"]["L" "5.4" "4.5"]])
(def v2 (rest (apply map vector v)))
(def f1 (map #(Float/parseFloat %) (first v2))
(def f2 (map #(Float/parseFloat %) (fnext v2))
(apply max f1)
(apply max f2)
My take:
(def v [["M" "3.4" "5.6"] ["L" "4.2" "6.6"] ["L" "4.9" "7.9"] ["L" "1.1"
"2.4"]["L" "5.4" "4.5"]])
(defn my-max [acc l]
(let [fs (map #(Float/parseFloat %) (next l))]
(map max acc fs)))
(reduce my-max [0 0] v)
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