help with this code. I keep getting error message

1 次查看（过去 30 天）

Folakemi Omotoye 2018-7-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412965-help-with-this-code-i-keep-getting-error-message

编辑： Walter Roberson 2018-8-1

when i execute the code below, i get the error message - Array indices must be positive integers or logical values.

n=30
t=0;    % initialisation
for t=1:1:n     %time intervals
    s(t)=sum(v(t-1));   %cumulative sum of the values before current value
    s(t)=sum(v(t))+s(t-1);  %cumulative sum of values up to current value
    g(t)=v(t) - min(v);    %current value minus minimum value in the matrix from first iteration to current iteration 
    if s(t) > 4
        disp(t)         %notify the time of change
     disp(v(t))             % if cumulative sum is greater than 4, display when change occurs
    end
    t=t+1;
end

note: v is a 1x30 vector.

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。

回答（1 个）

Adam Danz 2018-7-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412965-help-with-this-code-i-keep-getting-error-message#answer_331103

编辑：Adam Danz 2018-7-31

在 MATLAB Online 中打开

If you format your code using the {} button, people can help you more easily.

The first problem I see is the line below. On the first iteration, t = 1 so v(t-1) is v(0). As the error message indicates, indices must be positive integers or logicals. Here, 0 is neither and you're requesting the 0_th value of t which causes the error.

s(t)=sum(v(t-1));

Also, there's no sense in initializing t=0 prior to your for-loop where you redefine t as 1:1:n.