Contextual iso-triangular array P system and hexagonal picture languages

In this paper contextual string grammar model is extended to a two dimensional array grammar model, called contextual iso-triangular array grammar. Membrane computing is a computational model and in which P system is its device. It is a cell like structure model. We continue the study of linking these two areas by introducing contextual iso triangular array P system and we investigate its power in generating the hexagonal picture languages. The main interesting study is that makes use of contextual iso triangular array erasing rules of contextual iso triangular array P system, the star picture is generated.