Thanks all...Reduce() is the new function I learnt today... Thanks...
BR, Shubha
Shubha Karanth | Amba Research
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-----Original Message-----
From: Barry Rowlingson [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 04, 2008 8:49 PM
To: Shubha Vishwanath Karanth
Cc: [EMAIL PROTECTED]
Subject: Re: [R] sum of unknown number of matrices
Shubha Vishwanath Karanth wrote:
> 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?
Because do.call constructs a function call with the elements of l as
arguments, so you end up with:
"+"(1:4, 1:4, 1:4, 1:4)
but "+" only takes two arguments.
Use 'Reduce':
> Reduce("+",l)
[,1] [,2]
[1,] 4 12
[2,] 8 16
Barry
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