Error using plot Vectors must be the same length.

I'm trying to plot ID VDS characteristics for my designed mosfet but after i try to run the code it shows "Error using plot Vectors must be the same length.".

here is my code, thanks in advance

clc; clear all; close all;
%parameters and define variable
syms x y; 
un = 17215.771; 
Kox = 4.2; 
ep0 = 8.854e-12;
x0 = 50e-9; 
Cox = ((Kox*ep0)/x0); 
VTH = 0.5; 

VGS = 2; % [V]
eqna = 20.10364e-6 == 0.5 * un * Cox * (y) * ((VGS - VTH).^2)*(1 + (x * 3.75));
eqnb = 20.34537e-6 == 0.5 * un * Cox * (y) * ((VGS - VTH).^2)*(1 + (x * 4));
eqns = [eqna eqnb];
S = solve(eqns, [x y]);
x = S.x;
y = S.y;


figure(3);
Vgs = (1:0.5:5); 
Vds = (0:0.25:5); 
[sz1,sz2] = size(Vgs);
for t = (sz1:sz2)
    VDSAT2 = Vgs - VTH;
    VDSS = (0:0.25:VDSAT2(t));
    VDSS2 = Vgs(t) - VTH + 0.25:0.25:5;
    IDLinear = un.*Cox.*y.*(((VDSAT2(t)).*VDSS)-((VDSS.^2)/2));
    IDSat = 0.5.*un.*Cox.*y.*((VDSAT2(t)).^2).*(1+x.*(VDSS2));
    [u,v] = size(VDSS);
    [uu,vv] = size(Vds);
    for q = (1:v)
    ID(t,q) = IDLinear(1,q);
    end
    for r = (v+1:vv)
    IDD(t,r) = IDSat(1,r-v);
    end
    plot(VDSS,ID,[VDSS2 5],[IDD IDD]);
    hold on
end

Answer 1

[Jan]

Use the debugger to find the cause of the problem. Type in the command line:

dbstop if error

Run the code again. If it stops, check the sizes of the arguments provided to plot:

size(VDSS)
size(ID)
size([VDSS2 5])
size([IDD IDD])

Something is not matching. Which one?