  Recently, it has been proposed to analyse the literary works, plays or
novels, using graphs to display the social network of their interacting
characters. In this approach, the timeline of the literary work is lost,
because the storyline is projected on a planar graph. However, timelines can be
used to build some time series and analyse the work by means of vectors and
matrices. These series can be used to describe the presence and relevance, not
only of words in the text, but also of persons and places portrayed in the
drama or novel. In this framework, we discuss here an approach with
co-occurrence matrices plotted over time, concerning the presence of characters
in the pages of a novel. These matrices are similar to those appearing in
recurrence plots.
