Njoroge, James MwangiKivunge, BenardMuondwe, Samuel KanyiKinyanjui, Anthony Muthondu2015-05-292015-05-292013Asian Journal of Current Engineering and Maths 2 : 6 Nov – Dec (201 3 ) 374 - 390http://www.innovativejournal.in/index.php/ajcem/article/view/546/506http://hdl.handle.net/123456789/1179A real matrix is said to be – matrix if its principal minors are non - negative and all its non - diagonal entries are non - positive. In this project, we consider the – matrix completion problem. It is shown that any digraph with less than four directe d lines which is not a cycle has – completion. It is further shown that digraph of matrix with less than four directed lines which is a cycle does not have – completion.enArticle