Simulating a non linear model in Simulink

I am trying to model the non-linear system.

System Equations in Vector format:

Physical Parameters:

where x01, x02 and x03 are initial conditions representing displacement, velocity and acceleration.

In order to simulate this non-linear model I used a function block in Simulink:

My question is: Should I inlcude the initial conditions to the code below, and if so, how can I achieve this? Since in the code below the initial conditions are unused if initialized as they are.

function [xdot,y] = fcn(x,u)

    % define your constants
    g = 9.81;
    m = 0.05;
    R = 1;
    L = 0.01;
    C = 0.0001; 
%     x1 = 0.012;
%     x2 = 0;
%     x3 = 0.84;

  
    % nonlinear set of equations
    xdot = [x(2); g-((C/m)*(x(3)/x(1))^2); -((R/L) +(((2*C)/L)*(((x(2)*x(3))/((x(1))^2)))))] + [0;0;1/L]*u;

    y = x';