> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Petr > Klasterecky > Sent: Tuesday, February 27, 2007 12:15 PM > To: bunny , lautloscrew.com > Cc: r-help@stat.math.ethz.ch > Subject: Re: [R] Multiple conditional without if > > bunny , lautloscrew.com napsal(a): > > Dear all, > > > > i am stuck with a syntax problem. > > > > i have a matrix which has about 500 rows and 6 columns. > > now i want to kick some data out. > > i want create a new matrix which is basically the old one > except for all > > entries which have a 4 in the 5 column AND a 1 in the 6th column. > > > > i tried the following but couldnĀ“t get a new matrix, just > some wierd > > errors: > > > > > newmatrix=oldmatrix[,2][oldmatrix[,5]==4]&&oldmatrix[,2][oldma > trix[,6] > > ==1] > This is nonsense. > > > m <- matrix(rep(1:12,3),ncol=6) > > m[1,6] <-1 > > m > [,1] [,2] [,3] [,4] [,5] [,6] > [1,] 1 7 1 7 1 1 > [2,] 2 8 2 8 2 8 > [3,] 3 9 3 9 3 9 > [4,] 4 10 4 10 4 10 > [5,] 5 11 5 11 5 11 > [6,] 6 12 6 12 6 12 > > > m[!((m[,5]==4)|(m[,6]==1)),]
I think what was requested was to exclude rows where column 5 was 4 AND column 6 was 1, so, m[((m[,5]!=4)|(m[,6]!=1)),] <<<snip>>> Hope this is helpful, Dan Daniel J. Nordlund Research and Data Analysis Washington State Department of Social and Health Services Olympia, WA 98504-5204 ______________________________________________ R-help@stat.math.ethz.ch 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.