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Reorganization of rows and columns of a matrix does not modify data but may ease or impair visual analysis of data similarities in this structure, according to Gestalt spatial proximity laws. However, there are a factorial number of permutations of rows and columns. Matrix reordering algorithms, such as 2D sort and Sugiyama-based reordering, permute matrix rows and columns in order to highlight hidden patterns. Methods: We present PQR sort, a matrix reordering algorithm based on a recent datadoi:10.1186/1678-4804-20-3 fatcat:qo4o23tpw5eihi6kabiv33s5cm