Error using plot Vectors must be the same length. Error in Untitled3 (line 125)

I want to plot different graphs on the same axis for a fucntion S=f(z) at differente initial conditions Ti1 Ti2 and Ti3.

Init=[Fi1 Fi2 Fi3 Fi4 Fi5 Ti1
    Fi1 Fi2 Fi3 Fi4 Fi5 Ti2
    Fi1 Fi2 Fi3 Fi4 Fi5 Ti3];

for i=1:2
    x0=Init(i,:);
    zspan=[0 L];
    [z,x]=ode45(@mbrf,zspan,x0,[],Pt,rhoc,epsilon,Re,Ri,Perm4,Perm5,dHr1,dHr2,Tv,R,ms,dp,Po,Pa,MW1,MW2,MW3,MW4,MW5);
    
    plot(z,S,'r-','MarkerSize', 1,'LineWidth', 1), xlabel('z(m)'), ylabel('S')
    hold on
end

Answer 1

[Harsh]

Hi Paulino,

The error you are encountering is because of the difference in size of the “z” and “S” vectors in your code. You can check the size of a vector using the “size” function. Please ensure that both “z” and “S” are the same size.

Refer to the following documentation link for the “size” function - https://www.mathworks.com/help/matlab/ref/double.size.html

I hope this resolves your query. Happy coding!

[Walter Roberson]

Note that when you pass a zspan vector of length 2, the size of the output is variable.