# cat > data.general
file = /home/glykos/grid.matrix
grid = 100 x 100
format = ascii
interleaving = field
majority = row
field = field0
structure = scalar
type = float
dependency = positions
positions = regular, regular, 0, 1, 0, 1

end
<CTRL-D>

then edit data.general and change filename (/home/glykos/grid.matrix) and matrix dimensions (100 x 100). Then start dx and from import data load the data.general file. Click on visualize and you should see it.