knn search method for retrival

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new_user
new_user 2022-1-9
评论： KSSV 2022-1-9
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?

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KSSV
KSSV 2022-1-9
The methods available are:
'euclidean' (default)
'seuclidean'
'cityblock'
'chebychev'
'minkowski'
'mahalanobis'
'cosine'
'correlation'
'spearman'
'hamming'
'jaccard'
Yes, the defualt method is euclidean.
  2 个评论
new_user
new_user 2022-1-9
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
KSSV 2022-1-9
You need not to mention. Thr meaning of default is, if you don't use/ mention the method name default method will be used.

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