Nested loop error and saving result

Question

klb 2020-7-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558301-nested-loop-error-and-saving-result

评论： klb 2020-7-2

Getitng an " Index in position 1 is invalid. Array indices must be positive integers or logical values." error. What am I not doing right in this loop?

i = 0
results = [];
quantity=35;
for p = 1:quantity-2
     totalp = 0.23.*p + 4.0
    
    for q = p+1: quantity - 1
        totalq = 0.91.*q + 1.3
       
        for r =  q+1: quantity
            totalr = 0.30.*r + 3.3
            
            total = totalp + totalq + totalr;
            
            results(i,:) = [p,q,r,total];  %error is here: " Index in position 1 is invalid. Array indices must be positive integers or logical values." 
            i = i +1;
        end
    end
end
results

I am working with matrices only for my work. Thanks for your time in advance.

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

Walter Roberson 2020-7-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558301-nested-loop-error-and-saving-result#answer_459940

在 MATLAB Online 中打开

You start i = 0. You do not increment i until after you store a value. So the first time through, you are storing into results(0,:) . Which is not a valid location. Indices in MATLAB must start at 1.

You should move the

i = i +1;

to just before the assignment.