How to write a function ?

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

This doesn't seem to be very complicated. What did you try so far?

Answer 1

[David Hill]

y=-sin(x/15)*1000./((x-90).^2+(y-110).^2+60)+sin(x/30)*500./((x-55).^2+(y-55).^2+30)+80./(12+abs(x-15))+60./(12+abs(x-20))+80./(12+abs(x-25));

[Rik]

To improve readability I would suggest a line break after every term:

y=-sin(x/15)*1000./((x-90).^2+(y-110).^2+60) ...
    +sin(x/30)*500./((x-55).^2+(y-55).^2+30) ...
    +80./(12+abs(x-15)) ...
    +60./(12+abs(x-20)) ...
    +80./(12+abs(x-25));