MATLAB: Scatter plot: X and Y must be vectors of the same length

scatter

I want to plot the maximum height of an array. I am getting an error : X and Y must be vectors of the same length. Thanks for the help.
% 
zspan=[0,400];
v0mat = [1 0.01 1;1 0.05 1;1 0.1 1;1 0.2 1];
zsol = {};
v1sol = {};
v2sol = {};
v3sol = {};
for k=1:size(v0mat,1)
v0=v0mat(k,:);
[z,v]=ode45(@rhs,zspan,v0);
[~, Nsqr]=density1(z);
zsol{k}=z;
v1sol{k}=v(:,1);
v2sol{k}=v(:,2);
v3sol{k}=v(:,3);
%Maximum height
 ZH{k}=3.76*(pi.*v1sol{k}.*v1sol{k}.*v2sol{k}.*v3sol{k}).^(1/4).*(Nsqr.^(-3/4));
end
for r=1:length(ZH)
q(r)=r;
end  
for k2 = 1:length(ZH)
  Mzsol(k2)= max((ZH{k2}));
end
figure()
scatter(q,max(Mzsol),'g')
function [rho, Nsqr]=density1(z)
%%Data for desnity with respect to depth 
zval= [2 3 5 7 10 15 20 25 30 40 50 60 70 80 90 100 125 150 160 175 200 225 250 275 300 325 350 375 400];
rho1 = [17.2731684 17.1649375 21.43455647 22.4140625 23.86332207 24.3746967 24.70487685 24.6003125 24.8933125 25.42772826 26.03220776 26.439625 26.8151875 26.86830797 27.1949375 27.34406944 27.5551875 27.728625 27.23423729 27.88542857 27.752249049 28.1025 28.2415 28.37 28.05366667 28.6565 28.7755 28.898 29.013]; 
rho0=29;g=9.8;
zvala=400-zval;
zvalue=fliplr(zvala);
rho2=fliplr(rho1);
rho3=smoothdata(rho2,'lowess',5);
rho=interp1(zvalue,rho3,z);
rho4=interp1(zvalue,rho3,z+0.1);
N=(-g./rho0).*(rho4-rho);
Nsqr= sqrt(N);
end
function parameters=rhs(z,v)
[~, Nsqr]=density1(z);      
alpha=0.116; 
          db= 2*alpha-(v(1).*v(3))./(2*v(2).^2);
          dw= (v(3)./v(2))-(2*alpha*v(2)./v(1));
          dgmark= -Nsqr.*Nsqr-(2*alpha*v(3)./v(1)); 
 parameters=[db;dw;dgmark];
end

Best Answer

The problem is in the code
scatter(q,max(Mzsol),'g')
where q is yoour x and max(Mzsol) is your y.
max(MZsol) gives you 1 number, where q is a 1x4 double.
I don't know what you exactly want to show in this figure, but these two variables has to be the same size, the next code should be able to work
scatter(q,Mzsol,'g')
But again, I don't know if this is what you want
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