[R] simple question on loop

[Suzen, Mehmet]

Use mapply instead

On Fri, Nov 16, 2012 at 5:01 PM, billycorg <candilav at gmail.com> wrote:
> Hi R Users.
>
> I have a simple question on a loop.
>
> The following loop works fine:
>
> r_t=list()
> for(i in 1:500)
> {
> r_t[[i]]=h_t_half[[i]]%*%matrix(*z_t_m*[i,])
> }
>
> But indeed I need also that *z_t_m* varies. Let us suppose that *z_t_m* has
> 1000 replicates,
> I have written the following loop that (naturally) does not work.
>
> r_t <- list()
> for(r in 1:replicate)
> {
> for(i in 1:499)
> {
> r_t[[r]][[i]]=h_t_half[[i]]%*%matrix(*z_t_m*[[r]][i,])
> }
> }
>
> If, for instance, I try to do
>
> h_t_half[[1]]%*%matrix(*z_t_m*[[1000]][1,])
>
> I effectively obtain (only one row of) r_t.  But I need to have 1000
> replications of the whole r_t, that has 500 rows.
>
> Do you have any suggestions?
>
> Thank you!!!
>
>
>
> --
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>
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-- 
Mehmet Süzen, Ph.D. ( Dr.phil.nat. )
<suzen at acm.org>

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