Index exceeds the number of array error
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Sashi Mendoza
le 31 Mar 2022
Modifié(e) : Sashi Mendoza
le 3 Avr 2022
a = a certain 20x20 matrix;
[val,idx] = max(a(:));
[x, y] = find(a == val);
At the underlined part of the code, this displays the error "Index exceeds the number of array elements (1)". How to fix this?
3 commentaires
Stephen23
le 31 Mar 2022
"x = 11 and y = 21 though"
And why do you expect that IDX should be able to index into scalar numerics?
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Arif Hoq
le 31 Mar 2022
Modifié(e) : Arif Hoq
le 31 Mar 2022
var = randi(100,20,20);
[val,idx] = max(var(:))
[x, y] = find(var == val)
idx2=2;
x0 = x(idx2)
y0 = y(idx2)
here your idx=2(intentionally fixed) and your number of element of x and y is 7. so x0 and y0 can extract from index 2. now see the below example
%%
var = randi(100,20,20);
[val,idx] = max(var(:))
[x, y] = find(var == val)
% idx2=2;
x0 = x(idx)
y0 = y(idx)
here your idx=18, but your number of element of x and y is 5.so it can not extract form index 18. therefore, you are getting error.
2 commentaires
Arif Hoq
le 31 Mar 2022
as Stephen said already you can not specify index in a sclar value. you need a range of element.
x=1:2:1550;
idx = 631;
x0=x(idx)
idx or index extract the value from the position 631. if you notice in x the 631th value is 1261.
Stephen23
le 31 Mar 2022
"Stephen said already you can not specify index in a sclar value"
It is certainly possible to index into a scalar value:
A = 6;
A(1,1)
But just like any other indexing, those indices must be within the size of that (scalar) array.... which IDX is not.
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