matrix.to.grid: Convert data in matrix format to grid format with key columns...
In skranz/sktools: Helpful functions used in my courses

Convert data in matrix format to grid format with key columns corresponding to for row and col names and a value colum

1 2	matrix.to.grid(dat, row.var = "row", col.var = "col", val.var = "value", row.values = rownames(dat), col.values = colnames(dat))

`dat`	a data frame or matrix in matrix format
`row.var`	name of the variable corresponding to different rows
`col.var`	name of the variable corresponding to different columns
`val.var`	name of the variable corresponding to the values of the matrix
`row.values`	values of the row variable
`col.values`	values of the column variable