On 30 Jul 2010, at 15:03, Base 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.
Here's my first 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"]])
(->> v
(map rest)
(apply map (fn [& vals]
(apply max (map #(Float/parseFloat %) vals)))))
=> (5.4 7.9)
-Steve
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