Gene expression data are always in the form of a matrix. Thus, we use a matrix EXP with the size of m n to denote it, where m is the number of probes, which are used to obtain the expression value of each gene, and n is the total number of time points contained in the expression experiment. Let c be the number of cycles included in the expression experiment and nc be the number of time points in each cycle yields n = c nc. Considering the existence of unavoidable noise in the expression array (Wang et al., 2013),