standard euclidean distance, matlab

Helllo

I need help with standard euclidean distance, knew would someone help with matlab code ?

I can not use, matlab function, pdist, pdist2.

I need standard euclidean distance between two vectors.

Thanks.

Answer 1

[Walter Roberson]

 sqrt(sum((v1 - v2).^2))

[Tomas]

This is euclidean distance, i need standard euclidean distance

[Walter Roberson]

"Standardized Euclidean distance" perhaps? As described in http://www.mathworks.com/help/stats/pdist.html ?

[Tomas]

How to rewrite the formula into matlab ?

[Walter Roberson]

sqrt(sum((v1./nanstd(v1) - v2./nanstd(v2)).^2))

However this formula assumes v1 and v2 are vectors. If they need to be arrays, I would need to change the code.

[Tomas]

if it were arrays, how would it be?

Thank you for your help

[Walter Roberson]

sqrt(sum((A1 ./ repmat(nanstd(A1), size(A1,1), 1) - A2 ./ repmat(nanstd(A2), size(A2,1), 1)).^2, 2))

This would be for taking the distance for the rows of A1 to the corresponding rows of A2.

I am thinking that possibly it should be different, like this:

sqrt(sum(((A1-A2) ./ repmat( nanstd([A1;A2]), size(A1,1), 1)).^2,2))