w4mkmeans is a Planemo-built galaxy-tool-wrapper to wrap the stats::kmeans R package for clustering the dataMatrix produced by workflow4metabolomics (W4m). Using the intensities in the dataMatrix, w4mkmeans calculates the k-means clusters for samples or features and add them as columns to sampleMetadata or featureMetadata, respectively. If several, comma-separated K's are supplied, then one column is added for each K. This clustering is not hierarchical; each member of a cluster is not a member of any other cluster. For feature-clustering, each feature is assigned to a cluster such that the feature's response for all samples is closer to the mean of all features for that cluster than to the mean for any other cluster. For sample-clustering, each sample is assigned to a cluster such that the sample's response for all features is closer to the mean of all samples for that cluster than to the mean for any other cluster.