[R] sum of unknown number of matrices

From: Shubha Vishwanath Karanth <shubhak_at_ambaresearch.com>
Date: Wed, 04 Jun 2008 20:23:35 +0530


Hi R,  

I have a list of matrices. I need to get the sum of all the matrices in the list.  

Example:

a=b=c=d=matrix(1:4,2,2)

l=list(a,b,c,d)    

I need:

> a+b+c+d

     [,1] [,2]

[1,] 4 12

[2,] 8 16  

Something like do.call("+",l) is not working...why is this?    

I may not be knowing the number of matrices in the list...  

Thanks, Shubha  

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