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#' @title Partial ranking as directed graph


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#' @description Turns a partial ranking into a directed graph. An edge (u,v) is


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#' present if `P[u,v]=1`, meaning that u is dominated by v.


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#'


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#' @param P A partial ranking as matrix object calculated with [neighborhood_inclusion]


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#' or [positional_dominance].


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#' @return Directed graph as an igraph object.


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#' @author David Schoch


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#' @examples


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#' library(igraph)


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#' g < threshold_graph(20,0.1)


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#' P < neighborhood_inclusion(g)


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#' d < dominance_graph(P)


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#' \dontrun{plot(d)}


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#'


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#' # to reduce overplotting use transitive reduction


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#' P < transitive_reduction(P)


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#' d < dominance_graph(P)


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#' \dontrun{plot(d)}


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#' @export


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dominance_graph < function(P) { 

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d < igraph::graph_from_adjacency_matrix(P, "directed") 
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return(d) 
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}

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