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...,] 31 36 41 [3,] 32 37 42 [4,] 33 38 43 [5,] 34 39 44 The positions I wish to extract are 1 and 5 of the first row of each matrix (in my case are 25positions) and with this generate a new matrix with the form d= [,1] [,2] [,3] [1,] 1 15 30 [2,] 5 19 34 The ideais to builda loop toextract thisinformation from hundredsmatrices, butI failed todo so. Any helpwould be greatthank you very muchin advance regards .jpg [[alternative HTML version deleted]]