[R] simple question on loop

billycorg candilav at gmail.com
Fri Nov 16 17:01:36 CET 2012


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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