Geodesic
An approximation polynomial-time algorithm for a sequence bi-clustering problem
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 55 (2015) no. 6, pp. 1076-1085 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider a strongly NP-hard problem of partitioning a finite sequence of vectors in Euclidean space into two clusters using the criterion of the minimal sum of the squared distances from the elements of the clusters to the centers of the clusters. The center of one of the clusters is to be optimized and is determined as the mean value over all vectors in this cluster. The center of the other cluster is fixed at the origin. Moreover, the partition is such that the difference between the indices of two successive vectors in the first cluster is bounded above and below by prescribed constants. A 2-approximation polynomial-time algorithm is proposed for this problem. 
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A. V. Kel'manov; S. A. Khamidullin. An approximation polynomial-time algorithm for a sequence bi-clustering problem. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 55 (2015) no. 6, pp. 1076-1085. http://geodesic.mathdoc.fr/item/ZVMMF_2015_55_6_a13/

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