Hello everybody. Thank you again to Bert and Arun for their help on my previous question. I know have the following problem: I have a matrix : A = 1 2 3 4 5 6 7 8 9 9 8 7 4 5 6 3 2 1
And I would like to have : B = 1*4*7 2*5*8 3*6*9 4*7*9 5*8*8 6*9*7 7*9*4 8*8*5 9*7*6 9*4*3 8*5*2 7*6*1 Here I took the product of 3 rows each time. And 3 needs to be a parameter. Is it possible to do so without any loop ? Thank you in advance ! [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.