MATLAB: ??? Subscript indices must either be real positive integers or logicals.

Question

Help. I am very new to MATLAB and I am having problems creating a for loop within a for loop in order to draw a ruled surface.

Here is the script that makes the message appear above:

for u=0:.05:1
    for v=0:.005:1
        P=[1,1];
        P1=[5,1];
        P2=[2,4];
        P3=[6,3];
        puvx=P+u*(P1-P);
        puvy=P2+u(P3-P2);
        plot(puvx,puvy);
        grid on;
        axis square;
        hold on;
    end
end

What does this mean and how can I fix this? I am so lost. Thank you, Rachel

Answer 1

You forgot an "*"

puvy = P2 + u * (P3 - P2);