"Subscript indices must either be real positive integers or logicals" Error... How to solve this!

Question

ASMS Mat Su 2012-2-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29838-subscript-indices-must-either-be-real-positive-integers-or-logicals-error-how-to-solve-this

let ECd

ECd =
   15.7000
   33.9000
   10.2000
    8.4000
   40.7000
   37.4000
   37.2000
   37.8000
   33.7000
   31.6000
   26.7000
   22.9000
   19.6000
    6.1000
    1.9000
    1.5000
    1.4000
    1.2500
    1.8000
    2.3000
N = size(ECd,1);
for i = N:-1:1;
Min2(i-2)= min (ECd(i:N));          
Max2(i-2)= max (ECd(i:N));          
Mean2(i-2)= mean (ECd(i:N));       
Median2(i-2) = median(ECd(i:N));
Std2(i-2)= std (ECd(i:N));          
Q52(i-2)= prctile(ECd(i:N),[5]);
Q752(i-2) = prctile(ECd (i:N),[75]);
end

Its say im having this problem as below

??? Subscript indices must either be real positive integers or logicals.
Error in ==> VarCalculation_ASMS at 93
Min2(i-2)= min (ECd(i:N));          % Min value of ECd

I surf in the community, one of the answer is which size, which cell

I'm not sure what he meant! thanks

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Answer 1

Tom 2012-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/29838-subscript-indices-must-either-be-real-positive-integers-or-logicals-error-how-to-solve-this#answer_38250

the smallest value of i is 1, but you are assigning to an array by using i-2. So for the 2nd to last iteration of the loop you are trying to store in Min2(0). This doesn't exist in Matlab- the array is arranged from 1 to however many you need. This is the 'real or positive integers' part of the error.

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Tom 2012-2-21

the which size/ which cell bit from the other question refers to the fact that you can call a variable the same name as a function. So for example, there is a function called max, which unsurprisingly is used to find the maximum value in a group of numbers. But, if you call a variable 'max', then you can no longer use the max function.

Type 'which max' into the command window, then make a variable called 'max' (e.g. max=1), and type 'which max' again, and see the difference in what comes up.

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