Hi:

Is this what you're after?

x <- matrix(1:10, nrow = 2, byrow = TRUE)
rowSums(x[, 1:3])

HTH,
Dennis

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On Sun, Apr 3, 2011 at 6:10 AM, mustafabinar <mustafa_binar@mynet.com>wrote:

> Hello,
> &nbsp;
> I want to sum first three terms of each column of matrix.
> But I don't calculate with "apply" function.
> &nbsp;
> skwkrt&lt;-function(N=10000,mu=0,sigma=1,n=100,
> nboot=1000,alpha=0.05){
> x&lt;-rnorm(N,mu,sigma)#population
> samplex&lt;-matrix(sample(x,n*nboot,replace=T),nrow=nboot)
> #...
> }
> &nbsp;
> is that: suppose a is a 5x2 matrix.
> &nbsp;a={1,2,3,4,5
> 6,7,8,9,10}
> &nbsp;
> I want to sum first three terms.
> sm[1]=1+2+3
> sm[2]=6+7+8
> But I don't calculate. please help me!!!
>
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>
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