[R] matrices call a function element-wise

[Jonathan Christensen]

Hi,

I would recommend reformatting the data as a 2x2x1000 array and using apply.

Jonathan


On Mon, Jan 3, 2011 at 7:57 AM, zhaoxing731 <zhaoxing731 at yahoo.com.cn> wrote:
> Hello
>
> I have 4 1000*1000 matrix A,B,C,D. I want to use the corresponding element of the 4 matrices. Using the "for loop" as follow:
>
> E<-o
> for (i in 1:1000)
>    {for (j in 1:1000)
>  {
>         E<-fisher.test(matrix(c(A[i][j],B[i][j],C[i][j],D[i][j]),2))#call fisher.test for every element
>  }
>    }
>
> It is so time-consuming
> Need vectorization
>
> Yours sincerely
>
>
>
>
> ZhaoXing
> Department of Health Statistics
> West China School of Public Health
> Sichuan University
> No.17 Section 3, South Renmin Road
> Chengdu, Sichuan 610041
> P.R.China
>
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