Programming-Idioms

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Idiom #202 Sum of squares

Calculate the sum of squares s of data, an array of floating point values.

sumOfSquares = sum . map (^2)
(defn square [x] (* x x))

(def s (reduce + (map square data)))
(defn square [x] (* x x))

(def s (->> data (map square) (reduce +)))
(defn square [x] (* x x))

(def s (transduce (map square) + data))
s = sum( data**2 )
s = data.reduce((a, c) => a + c ** 2, 0)
import java.util.Arrays;
Arrays.stream(data).map(i -> i * i).sum()
math
var
  data: array of double;
...
  s := SumOfSquares(data);
...
use List::Util qw(sum);
my $s = sum map { $_ ** 2 } @data;
s = sum(i**2 for i in data)
s = data.sum{|i| i**2}
let s = data.iter().map(|x| x.powi(2)).sum::<f32>();

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Idiom created by

Bart