How to remove all objects except the sequence

Dear All:

I would like to know if there is plausible way to say to R to remove all
elements in the memory but the sequence. I have a code which makes a loop,
and what I want is after the programme has performed all the operation over
every "i"th element, to remove all the objects, expect the sequence
parameter. I included the option "rm(list=ls(all=TRUE))", but obviously that
removes the sequence as well.  I know that I can give the names of the
objects to remove, but instead of doing so I would like to tell R remove all
but the sequence. Is there a way for doing so? The reason for removing all
the objects after each operation is saving some memory, as the operation I
am doing involves some bootstrapping, after the loop reaches a certain "i"th
element, the operations start to be really slow. So I want to faster the
loop by removing the objects and free memory after every operation.
Below is my code:

setwd("C:\\Dokumente und Einstellung\\.....")
library("tsDyn")

z<-(1:1000)### sequence parameter
sink("prueba.txt")
for (i in seq(z))
{
P1<-read.csv("2R_EQ_P_R1.csv")
P2<-read.csv("2R_EQ_P_R2.csv")
c<-data.frame(P1[i],P2[i])
c.t<-ts(c)*-1
try(print(z[i]))
try(SeoTest<-TVECM.SeoTest(c.t, lag=1, beta=1, trim=0.1, nboot=100))
try(summary(SeoTest))
rm(list=ls(all=TRUE)) ### Here I want to erase all but "z"
}

best,

Sergio Ren?

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