sign(a)*abs(a)^(1/3) # [,1] #[1,] -1.000000 #[2,] -1.259921 #[3,] -1.442250 A.K.
----- Original Message ----- From: Sachinthaka Abeywardana <sachin.abeyward...@gmail.com> To: "r-help@r-project.org" <r-help@r-project.org> Cc: Sent: Tuesday, July 2, 2013 11:11 PM Subject: [R] nth root of matrix Hi all, I want to do the following: a=matrix(c(-1,-2,-3)) a^(1/3) #get 3rd root of numbers[,1] [1,] NaN [2,] NaN [3,] NaN All I get is NaNs, what is the proper way of doing this? Would like to retain the fact that it is a matrix if possible (not a requirement though). Thanks, Sachin [[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. ______________________________________________ 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.
