tt2matrix: Extracting data from a toptable and format it to matrix
In coRNAi: Analysis of co-knock-down RNAi data

Description Usage Arguments Value Author(s) Examples

Given an dataframe with data, typically from the interactiontable, the gene pair data is converted to a symmetric matrix.

1	tt2matrix(toptable, what)

`toptable`	a dataframe with data for the pairwise interactions. Typically from the `interactiontable` function.
`what`	character indicating which of the columns in the dataframe should be used in the matrix.

a symmetric matrix with the selected data for gene pair i,j in matrix[i,j] and matrix[j,i]

Elin Axelsson

## simulated data
mytoptable = data.frame("ID" = c("A B", "A C", "B C"),"size"=c(1:3),stringsAsFactors=FALSE)
rownames(mytoptable) = mytoptable$ID
mat = tt2matrix(mytoptable,what="size")