Thank you Henrique,
I still dont understand why my code doesnt work ? According to the definition of apply function it should work no ? From: Henrique Dallazuanna [mailto:www...@gmail.com] Sent: Tuesday, June 01, 2010 7:34 PM To: Joachim de Lezardiere Cc: r-help@r-project.org Subject: Re: [R] Problem using apply The mean by col and by row are the same: colMeans(m) == rowMeans(m) So: m / rowMeans(m) # You don't need apply here m / colMeans(m) On Tue, Jun 1, 2010 at 2:26 PM, Joachim de Lezardiere <joachim.lez...@gmail.com> wrote: Hello , I can not get apply function to do what I want when doing stuff on rows. Let's say I want to divide the rows of matrix by their mean, the below show you get the same result weather you use 1 or 2, i.e. same result for columns than for means..:( Thanks a lot for the help, m = matrix( c(1,4,7,4,5,8,7,8,9), nrow = 3 ) divideByMean = function( v ){ return( v/mean(v)) } rowMean = c( mean( m[1,]),mean( m[2,]),mean( m[3,]) ) rowMean colMean = c( mean( m[,1]),mean( m[,2]),mean( m[,3]) ) colMean m print("ByRow") apply( m, 1, divideByMean) print("ByCol") apply( m, 2, divideByMean) [[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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[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.
