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

Question

Rachel 2012-10-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/50335-subscript-indices-must-either-be-real-positive-integers-or-logicals

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Razvan 2012-10-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/50335-subscript-indices-must-either-be-real-positive-integers-or-logicals#answer_61452

在 MATLAB Online 中打开

You forgot an "*"

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

2 个评论
显示无隐藏无

Rachel 2012-10-10

It still didn't help me out completely. I actually needed to reformat my answer to include the bezier equation as well as the ruled surface equation for both G(u) and Q(u). I did this, and it worked.

Razvan 2012-10-10