data manipulation between vector and matrix

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 <tmrsg11 at gmail.com>
To: Sarah Goslee <sarah.goslee at gmail.com>
Cc: r-help <r-help at 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

Hi,

On Wed, Dec 5, 2012 at 1:30 PM, C W <tmrsg11 at 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]]

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