Before revision:  According to our model, structure analysis can be formally defined as decomposing a traffic matrix into low-rank, sparse, and noise sub-matrixes , which is equal to the Robust Principal Component Analysis (RPCA) problem defined in [13].
After revision:  According to our model, structure analysis can be formally defined as decomposing a traffic matrix into three sub-matrices, namely, the deterministic traffic, the anomaly traffic and the noise traffic matrix , which is equal to the Robust Principal Component Analysis (RPCA) problem defined in [13].