x-min
x-max
y-min
y-max
z=
z = x*x - y*y
z = 4 * (x*x + y*y)
z = (cos(x) + cos(y)) / (4 + |x| + |y|)
z = 10 - |x| - |y|
1
X
0
-0.5
Y
0
-0.5
-1
1
X
0
-0.5
1
Z
0
-0.5
Y
0
-0.5
-1
1
Z
0
-0.5