This function transforms correlations or other measures of similarity into an unweighted network adjacency.
signumAdjacencyFunction(corMat, threshold)a matrix of correlations or other measures of similarity.
threshold for connecting nodes: all nodes whose corMat is above the threshold
will be connected in the resulting network.
An unweighted adjacency matrix of the same dimensions as the input corMat.
Bin Zhang and Steve Horvath (2005) "A General Framework for Weighted Gene Co-Expression Network Analysis", Statistical Applications in Genetics and Molecular Biology: Vol. 4: No. 1, Article 17
adjacency for soft-thresholding and creating weighted networks.