I believe you want to select a subset of rows and subset of columns of your original matrix m.
If you had wanted only the first row of m, you could have used m[1,] Alternatively, if you had wanted only the second column of m then you could have used m[,2] m[1,2] would give you the element at row 1, column 2. You are requesting rows 2,7, and 8 and columns 1,4,6 and 7. The syntax is m[required rows, required columns] c() allows you to specify multiple rows/columns at the same time. HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/How-to-doulbe-all-the-value-on-a-matrix-tp3221213p3221255.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
