![]() The distance to the nearest mean is taken as the euclidean distance.K-means Algorithm Details (Source: Wikipedia): Given a set of observations (x1, x2, \342\200\246, xn), where each observation is a d-dimensional real vector, k-means clustering aims to partition the n observations into k (\342\211\244 n) sets S = so as to minimize the within-cluster sum of squares (WCSS) (sum of distance functions of each point in the cluster to the K center). ToleranceDescription : specifies the convergence criterion.Type : positive real constantDefault : 1e-4ĭescriptionK-means clustering partitions N observations into K clusters in which each observation belongs to the cluster with the nearest mean. FileToolsText ReadLine read a line from a file Calling Sequence Parameters Description Examples Calling Sequence ReadLine( file ) Parameters file - file. If the file is not open prior to calling ReadFile then it will be closed before returning. For files previously opened, the result string contains all the characters from the current file position to the end of file. data : the original data set, X.initcenter : a N (number of clusters) x d, where d is the column dimension of X, Matrix containing the initial values for the cluster centers.distance : a M (number of data points in X ) x N ( number of clusters ) Matrix containing the euclidean distance from a given point to each of the N centers.cluster : a M (number of data points in X ) x 1 Vector containing the assigned cluster for each point.numiterations : the number of iterations used before hitting the convergence criterion.tss : the total sum of squares for points from their respective cluster centers across the N clusterstally : the total number of points in each cluster. The ReadFile (file) command reads a string containing all the characters in the file. Each of the outputs can be queried using :-outputname.center : a N (number of clusters) x d, where d is the column dimension of X, Matrix containing the values for the cluster centers. Output can be specified as either a name taken from the list, or a list containing a combination of names taken from this list.Type : list, nameDefault : RecordValues:record : a record which contains all of the following output options. OutputDescription : specifies the output returned from the KMeans command. MaxiterationsDescription : specify the maximum number of iterations to use.Type : posintDefault : 100 IntitializationmethodDescription : specify the initialization method.Type : identical( Forgy, Random )Default : Forgy ![]() ĬlustersDescription : specify the number of clusters to group the data into.Type : posintDefault : 2 ![]() OptionsSpecified keyword options of the form option=value, where option can be any of the following. XDescription : specifies the dataset.Type : data set or Matrix data set ClusterAnalysis/KMeansGroup similar points into cluster To display the help page for a particular FileTools command, see Getting Help with a Command in a Package. For more information, see Module Members. ", even for multibyte newline representations.Įach command in the FileTools subpackage can be accessed by using either the long form or the short form of the command name in the command calling sequence.Īs the underlying implementation of the FileTools subpackage is a module, it is also possible to use the form FileTools:-command to access a command from the package. The FileTools commands recognize a newline character in a file and return it as " When writing, Maple uses the native newline character to represent newlines. To accommodate this when reading a text file, Maple recognizes all three newline representations as a valid newline. The major incompatibility is that Windows, UNIX, and Macintosh all have different representations for newline characters. Text files represent data by converting the Maple representation into strings and then writing the strings to the file. These commands allow the creation, reading, and writing of files using text format. As well, text files can contain formatting information in the form of newlines. The FileTools Text subpackage is a collection of text file manipulation utilities. The FileTools subpackage is a collection of text file manipulation utilities.
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