knn search method for retrival

I can't clearly understand that the matlab function: "Idx = knnsearch(X,Y)" searches for nearest neighbours. But what method it uses for search? I read default method is eucledain but I didn't input any method. I just used [Idx, b] = knnsearch(X,Y,'K',10). So will it use eucledainas the default method?

Answer 1

[KSSV]

The methods available are:

'euclidean'	(default)
'seuclidean'
'cityblock'	
'chebychev'	
'minkowski'	
'mahalanobis'
'cosine'	
'correlation'
'spearman'	
'hamming'	
'jaccard'

Yes, the defualt method is euclidean.

[new_user]

I mean just using this " [Idx, b] = knnsearch(X,Y,'K',10)" will the distance be automatically calculated using eucledian??? or I have to add "[Idx, b] = knnsearch(X,Y,'K',10, distance)" ??

[KSSV]

You need not to mention. Thr meaning of default is, if you don't use/ mention the method name default method will be used.