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