[R] Analog to matlab repmat function

From: Daniil Ivanov <daniil.ivanov_at_gmail.com>
Date: Mon 29 May 2006 - 11:09:58 EST


Hello,

 I'm trying to switch from Matlab to R-project, and having some difficulties.  I make a use of multidimensional matrices. For example, I need to extract  mean from one of the dimensions:

 % we have matrix data of size: 130 x 11 x 350 x 2  data = data - repmat(mean(data,3),[130 1 1 1]);

 In R project I managed to do that in a very pervarsive way:

# mean(data,3) in R
 base <- apply(data,c(2,3,4),mean)
# repmat(...,[130 1 1 1])
 base <- rep(base,130)
 dim(base) <- c(11,2,350,130)
 base <- aperm(base,c(4,1,2,3))
# data = data - repmat

 data <- data - base;

 Could you please show me a more elegant way of doing the same in R :)

Thanks, Daniil.



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