thanks, I knew about apply, but did not you you can put plus signs with quotes. That's a cool tricky, Mike
On Wed, Dec 5, 2012 at 4:05 PM, arun <smartpink...@yahoo.com> wrote: > HI, > In addition to ?sweep(), you can use > > apply(-mat,1,`+`,x) > > #or > library(plyr) > aaply(-mat,1,"+",x) > > > A.K. > > > > > > > ----- Original Message ----- > From: C W <tmrs...@gmail.com> > To: Sarah Goslee <sarah.gos...@gmail.com> > Cc: r-help <r-help@r-project.org> > Sent: Wednesday, December 5, 2012 1:51 PM > Subject: Re: [R] data manipulation between vector and matrix > > Thanks, Sarah. First time heard about sweep(), it worked just the way I > wanted. > Mike > > On Wed, Dec 5, 2012 at 1:42 PM, Sarah Goslee <sarah.gos...@gmail.com> > wrote: > > > Hi, > > > > On Wed, Dec 5, 2012 at 1:30 PM, C W <tmrs...@gmail.com> wrote: > > > Dear list, > > > I was curious how to subtract a vector from matrix? > > > > > > Say, I have > > > > > > mat <- matrix(1:40, nrow=20, ncol=2) > > > > > > x <-c(1,2) > > > > Thanks for the actual reproducible example. > > > > > I want, > > > > > > x-mat[1,] and x-mat[2,], and so on... Basically, subtract column > elements > > > of x against column elements in mat. > > > > > > But x-mat won't do it. > > > > This will (note the modification to get x - mat): > > > sweep(-mat, 2, x, "+") > > [,1] [,2] > > [1,] 0 -19 > > [2,] -1 -20 > > [3,] -2 -21 > > [4,] -3 -22 > > [5,] -4 -23 > > etc. > > > > -- > > Sarah Goslee > > http://www.functionaldiversity.org > > > > [[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. > > [[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.
