Coding to find difference between two lines on a x y plane

is there a way to generate a code on MatLab that will find the difference between two different lines?

For example, I have a straight line (linear) with the following points (-10,1) (10,1) and I have a nonlinear line on the x y plane and I need to find the difference between the linear and nonlinear curve

[KSSV]

Do you have points i.e (x ,y) for the nonlinesr curve?

If so, make points for line equal in number to curve with same x values...and subtract the y-values.

[VBBV]

 % if true
    % code
 % end
K = 2.5;
X = linspace(-10,10,100);
Y = K*((X/20)).^3;
Ly = ones(1,100);
Diff = Ly - Y;
plot(X,Diff,'r',X,Ly,'k',X,Y,'b');
legend('Diff','linear','nonlinear');

Answer 1

[Manvi Goel]

You can plot the difference between the two lines by simply passing the second argument to the plot function as y - z where y and z are the two lines respectively.

X = linspace(-10,10,100); %line 1
Y = sin(X); %line 2
Z = ones(1,100);
plot(X, Y - Z); %plot for the difference