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There used to be a package called knnflex for language R, but it is not any longer available from CRAN. I have got the tar files, but how I can install it under R?
also is there any other package that can support knn.dist or knn.predict?
Package FNN. A collection of fast k-nearest neighbor search algorithms and applications including a cover-tree, kd-tree and the nearest neighbor algorithm in package class. In addition, KNN classification, regression and information measures are also implemented.
See http://cran.r-project.org/web/packages/FNN/index.html