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- ; Esc select Plot Plot, Delete All, Algebra, Transfer Demo
- 1 / (9 + x^2 + y^2)
- ; A mountain and a crater
- - y / (9 + x^2 + y^2)
- ; Two mountains
- 1 / (9 + x^2 + (y - 3)^2) + 1 / (9 + x^2 + (y + 3)^2)
- ; A hanging valley
- 7 * x^2 - y^3
- ; A saddle
- y^2 - x^2
- ; A sway-back roof
- y^2 / 5 - 3 * ABS x
- ; A pinched ridge
- (y^2 + 1/10) / (x^2 + y^2 + 1/10)
- ; A monkey saddle
- y * (3 * x^2 - y^2)
- ; A pinched monkey saddle
- x*y * (SIGN (x + 1/10) * SQRT (x^2 + y^2) + 2*y) / (x^2 + y^2 + 1/10)
- ; Intersecting ridges
- - SQRT ABS (x*y)
- ; A pagoda roof
- - SQRT ABS x - SQRT ABS y
- ; A ridge intersecting a valley
- SQRT ABS x - SQRT ABS y
- ; A ridge that becomes a valley
- - y * SQRT ABS x
- ; A volcano
- 50 / (50 + ((x^2 + y^2)^(1/2) - 37/10)^2) - 1
- ; A sombrero
- COS ((x^2 + y^2) / 4) / (3 + x^2 + y^2)
- ; A surfer's perfect wave
- EXP (- x/9) * (pi / 2 - ATAN y)
- ; A cliff is born
- ATAN (- y, x + 1/10)
- ; Two mountains separated by a crater
- - COS (3 * PI * X/10) * COS (PI * Y /10)
- ; Three mountains
- - COS (3 * PI * X/10) * SIN (PI * Y/5)