Display array data as contours and density plot

Create a `32×32` array `Z`, where `Z(x,y) = exp(-((x/15)^2+(y/12)^2))` for `-5 ≤ x ≤ 26` and `-10 ≤ y ≤ 10`. Display as a contour plot and as density plots.

The following script will perform the desired operations:

     generate x -5,,26 32
     generate y -10,,10 32
     matrix z 32 32
     do j=[1:32]
       do k=[1:32]
         z[k,j] = exp(-((x[j]/15)^2+(y[k]/12)^2))
       enddo
     enddo
     window 5
     contour\legend x y z 20
     window 6
     set colormap thermal
     density x y z
     window 7
     density\diffusion x y z
     window 8
     density\dithering x y z

Read `32×24` elevation data from file e.dat.
Display as a contour map and as density plots.

     read\matrix e.dat elevation 32 24
     window 5
     contour\legend elevation 15
     window 6
     set colormap topo256
     density elevation
     window 7
     set colormap gray256
     density elevation
     window 8
     density\diffusion elevation

Analyze data using FFT
Plot parametric functions