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

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ASMS Mat Su
ASMS Mat Su 2012-2-21
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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回答（1 个）

Tom
Tom 2012-2-21
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.
  1 个评论
Tom
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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