MATLAB: Blank plot in matlab

blank plot

hello can you please help me?? when i type this code i only get a balnk plot
i don`t know where is my mistake
the code
sigma0=0;
el= 0.5;
L= 1 ;
h= 0.5 ;
a= 1;
N= 3;
g=10;
rho=1000;
Z0=0;
t=0:0.01:5;
x=0:0.02:el;
y=0:0.02:L;
[X,Y]=meshgrid (x,y);
sigma=0;
T=3*pi/4;
for n=0:N
    for m=0:N
        A=pi*((m/el)^(2)+(n/L)^(2))^(0.5);
        B=(g*A+(sigma/rho)*A^3)*atan(A*h);
        C=B^(0.5); 
        Z=a*cos(C.*T).*cos((m*pi/el).*X).*cos((n*pi/L).*Y);
        Zs=Z0+Z;
        Z0=Zs;
       
    end
end
  m=3;
  n=4;
    
A=pi*((m/el)^(2)+(n/L)^(2))^(0.5);
B0=(g*A+(sigma0./rho)*A^3)*atan(A*h);
C0=(B0.^(0.5)); 
Z0=(a.*cos(C0.*T)).*cos((m*pi/el).*X).*(cos((n*pi/L).*Y));
figure
subplot(221)
plot(t,length(Z0));
xlabel(' temps s');
ylabel(' élévation z(x,y)y');
title(' sans tension superficielle');
legend('sigma0')

Best Answer

The immediate problem is: 
plot(t,length(Z0));
since the length function will produce a scalar, and you can only plot a scalar using a marker. (The plot function plots lines between two defined points, and a scalar has only one.)
Beyond that, however, ‘Z0’ is not a function of ‘t’, and has entiely different dimensions as the result, so you cannot plot it as a function of ‘t’.
This works: 
plot(Z0);
however it is likely not the result you want. You need to fix that problem.
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