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
______________________________________________
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.
