This file is indexed.

/usr/lib/R/library/class/INDEX is in r-cran-class 7.3-11-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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SOM                     Self-Organizing Maps: Online Algorithm
batchSOM                Self-Organizing Maps: Batch Algorithm
condense                Condense training set for k-NN classifier
knn                     k-Nearest Neighbour Classification
knn.cv                  k-Nearest Neighbour Cross-Validatory
                        Classification
knn1                    1-nearest neighbour classification
lvq1                    Learning Vector Quantization 1
lvq2                    Learning Vector Quantization 2.1
lvq3                    Learning Vector Quantization 3
lvqinit                 Initialize a LVQ Codebook
lvqtest                 Classify Test Set from LVQ Codebook
multiedit               Multiedit for k-NN Classifier
olvq1                   Optimized Learning Vector Quantization 1
reduce.nn               Reduce Training Set for a k-NN Classifier
somgrid                 Plot SOM Fits