Document Type: Research Paper
Department of Mathematics, Arak university, Arak, Iran
Department of Mathematics, Shahid Rajaee University, Lavizan, Tehran, Iran
In this paper for a given set of real or complex interval numbers $\sigma$ satisfying special conditions, we find an interval nonnegative matrix $C$ such that for each point set $\delta$ of given interval spectrum $\sigma$, there exists a point matrix $A$ of $C$ such that $\delta$ is its spectrum. We also study some conditions for the solution existence of the problem.