- First we define the domain:
**octave:102> x = [-2:0.1:2]; y = x;** - Then we generate the mesh grids:
**octave:103> [X Y] = meshgrid(x,y);** - We can now calculate the range of
*f*for all combinations of*x*and*y*values in accordance with Equation (3.4):**octave:104> Z = X.^2 – Y.^2;** - To make a surface plot of the graph we use:
**octave:105> surface(X,Y, Z)**The result is shown below:

In Command 103, `X`

is simply a matrix, where the rows are copies of `x`

, and `Y`

is a matrix where the columns are copies of the elements in `y`

. From `X`

and `Y`

, we can then calculate the range as done in Command 104. We see that `Z`

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