Azzera filtri
Azzera filtri

Computing Euclidean distance between 2 points

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I found a code computing Euclidean distance as
diff = q - p;
dist = sqrt(diff * diff');
is there any difference from the standard Euclidean distance formula, why transpose is taken?

Risposta accettata

Rik il 3 Mag 2022
Modificato: Rik il 3 Mag 2022
By doing a matrix multiplication on a vector, you implicitly take the sum over all elements.
Note that this will only work if both p and q are row vectors.
diff * diff' , sum(diff .* diff)
ans = 0.6624
ans = 0.6624

Più risposte (1)

Bruno Luong
Bruno Luong il 3 Mag 2022
Modificato: Bruno Luong il 3 Mag 2022
For a row vector d
% sum(d.^2)
is equal to
% d*d'
d = 1×3
9 6 5
ans = 142
ans = 142

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