Convert from 'long' format (3-column data.frame) to 'wide' format (matrix with names rows and cols). See make.long.format for the reverse.
make.wide.format(x)a data.frame, in which the first two columns (character) give the names of each pair of nodes, and the third (numeric or integer) gives the degree of association between those nodes.
a matrix containing the value of the association function between each pair of nodes