Using a loop to impose specific values

Let's say I have a range of x going from -200 to + 200 and I want to force a function to take different initial conditions in these seperate regions. I.e., when x <= 0 we have say condition 1 and when x>0 we have condition 2.

I might not be explaining this terribly well but I feel an if or while loop may be required which imposes this.

Answer 1

[Matt J]

For example,

x=linspace(-1,1,1000);

plot(x,twoparts(x))

function y=twoparts(x)
  y=abs(x);
  region=x>0;
  y(region)=x(region).^2;
end