अपने डेटा को Standardize करना

# Extract columns 5-12 of combine
A <- combine[, ___:___]

# Make A into a matrix
A <- ___(A)

# Subtract the mean of each column
A[, ___] <- A[, 1] - mean(A[, 1])
A[, 2] <- A[, 2] - ___(A[, 2])
A[, ___] <- A[, 3] - mean(A[, 3])
A[, ___] <- A[, ___] - mean(A[, 4])
A[, 5] <- A[, 5] - mean(A[, 5])
A[, ___] <- A[, 6] - mean(A[, ___])
A[, 7] <- A[, ___] - mean(A[, 7])
A[, ___] <- A[, 8] - mean(A[, 8])