[R] how I can explore the variable names in my covariance matrix?

[malcolm]

QQ<-diag(7)
for (j in 1:7){
for (k in 1:7){
sum=0
for (i in 1:50){
sum=sum+(Y[i,j]-mean(Y[,j]))*(Y[i,k]-mean(Y[,k]))
}
QQ[j,k]=sum/49
}
}
round(QQ,2)
this is the function I made


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