how to change x and y values to a range of values

How can i change the variables X and Y values to a range of values in the code below? Its already in a loop and i used "hold on" to keep the plots previosly so the results are combined in one graph. Thanks in advance. In the code below i used one value for X and one value for Y, but i'd like to use the Y value range that i commented in the code.

clear all
clc

Vinf=100;                                       % Input Vinf
a=deg2rad(15);                                  % Input Alpha in degrees
N=100;                                          % Number of Free Vortexes
c=1;                                            % Length of chord c
X=-2*c;
% Y=linspace(-.7*c,0.1*c,20);
Y=-.7*c;
DeltaT=4e-8;

k=nonzeros(0:c/N:1);
for i=1:length(k)
    s(i)=k(i);                                  % si
    s1=k(i)-(c/N);                              % si-1
    
    % s2 is the center of free vortex i
    s2=(s(i)+s1)*0.5;
    
    ai=(s2*cos(a));
    bi=((-s2)*sin(a));
    
    Thetai=acos(1-2*s(i));                      % θi
    Thetai_1=acos(1-2*s1);                      % θi-1
    
    G1(i)=(a*Vinf)*(Thetai-Thetai_1);
    G2(i)=(2*a*Vinf)*[(sqrt(s(i)-s(i).^2))-(sqrt(s1-s1.^2))];
    
    % Stength Gi of free vortex "i"
    G(i)=G1(i)+G2(i);
    
    u(i)=(G(i)/(2*pi))*((Y-bi)/((X-ai)^2+(Y-bi)^2));
    v(i)=((-G(i))/(2*pi))*((X-ai)/((X-ai)^2+(Y-bi)^2));

end
    UDT=u*DeltaT;
    VDT=v*DeltaT;
    DD=X+UDT;
    D2=Y+VDT;
    plot(DD, D2,'-or')
    hold on