gistfile1.nim

const WIDTH = 640
const HEIGHT = 327

type
  TField = tuple
    a: float
    b: float
    c: float
    d: float
    e: float
  TRow = array[0..WIDTH - 1, TField]
  TGrid = array[0..HEIGHT -1, TRow]
  TWorld = tuple
    grid: TGrid

proc display(world: TWorld) =
  for r, row in world.grid:
    for c, field in row:
      echo("init " & $(r) & " " & $(c))

var w: TWorld

w.display()