Multi formula ode implementation

How do i implement an ODE defined by more than one formula.

Answer 1

[Ameer Hamza]

You can define it in the ODE function

IC = 0; % initial conditions
tspan = [0 10]; % initial conditions
ode45(@odefun, tspan, IC)

function dxdt = odefun(t, x)
    if x < 0
        dxdt = -x;
    else
        dxdt = x.^2;
    end
end