Ok, I am sorry, I was building a reproducible example to post here and I made
a mistake. Th second loop (in the variable k) updates ycorr.
Therefore, it would be

ycorr <- rnorm(10)
Nindiv <- 10
x <-matrix(sample(c(0:2),50,re = T),10)
gtemp <- rnorm(10)
for (i in 1:Nindiv) {
        for (k in 1:ncol(x)) {
                ycorr[i] <- ycorr[i] - x[i,k]*gtemp[k]
        }
} 

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