On the Improved Nonsingularity of the r-Circulant Matrices

Circulant matrix is important since it is an active research field of applied mathematic and computation mathematic increasingly. R-circulant matrices have applied in numerical computation, signal processing, coding theory and oil investigation in recent years, and so on. In this paper, we give some discriminations by using only the elements in the first row of the r-circulant matrix on non singularity, and give an example at last. Example indicate that the proposed discriminations are simple and accurate.