[R] calculation problem when export and import data

[aegea]

Hello,

I have a question on export and import data. Thank you for any suggestions.

data 'simul' is generated as follows:
N     <- 20                    
n     <- N/2
nsets <- 10
simul <- matrix(0,nsets,N)
th    <- c(0,1, 1)
for(i in 1:nsets){
    simul[i,] <- rnorm(N,mean= rep(th[1:2],N/2),sd=th[3])
}

I exported data as follows:
write.table(simul, file="D:\\test.txt", row.names=F, col.names=F)

When I want to use this data, I imported as follows:
a=read.table("D:\\test.txt")

So far, it works well. When I deal with data, I need use each row to do
calculations:

for(rep in 1:nsets){
y   <- a[rep,]
b<-c(mean(y)+3, mean(y)-4) # cannot calculate mean(y), the mean of this row
m<-sd(y)   # also cannot calculate sd(y)
}

I need a lot of calculation based on y, but after I imported data, R comes
error on it. 

Could you please give me some suggestions?


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