
On Jan 18, 2010, at 9:21 PM, rusers.sh wrote:

> If the number of datasets for a* is small (here is 3), it is ok for  
> creating b_ijn[i, j, nn] and make assignments to it. But it will be  
> a little bit impossible for a larger number of datasets for a*, say  
> 999. We may need 999 lines to do this. Maybe there are other  
> alternatives.

Read more carefully. The b_ijn[ , , ] array can be pre-dimensioned to  
any size. You must know the size since you are specifying a loop range.


>
> 2010/1/18 David Winsemius <dwinsemius@comcast.net>
>
> On Jan 18, 2010, at 7:19 PM, rusers.sh wrote:
>
> Hi,
>  See example.
>  for (i in 1:2) {
>  for (j in 1:3) {
>    b_1[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[1]
>   b_2[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[2]
>    b_3[i,j]<-rank(c(a1[i,j],a2[i,j],a3[i,j]))[3]
>  }
> }
>  The inner codes is really repeated, so i want to change the inner  
> codes
> into loops. Take nn is from 1 to 3,
> something like,
>  for (nn in 1:3) {
> b_nn[i,j]<-rank(c(a1[i,j]:a3[i,j]))[nn]
> }
>  Anybody can tell me the correct method to specify the above codes?
>
> There is no correct method. You cannot index on the object name b_nn  
> that way. R has not been developing using a syntax with that much  
> flexibility.  If you want a 3D array of values, then you could  
> create b_ijn[i, j, nn] and make assignments to it. But if you tried  
> to do this with paste and assign, you will spending considerably  
> more time degbugging it than it is worth and it would likely be more  
> inefficient than what you have.
>
> -- 
> David.
>
> Thanks.
>
> -- 
> -----------------
> Jane Chang
> Queen's
>
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>
>
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>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>
>
>
> -- 
> -----------------
> Jane Chang
> Queen's


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