Easy for loop question
2 views (last 30 days)
Show older comments
I'm trying to make a simple For Loop:
for i=1:603
if A(i,2)>((A(i-1,2)+A(i+1,2))/2)*10
A(i,:)=[];
and i'm getting the error:
"Subscript indices must either be real positive integers or logicals."
I don't understand why, since i is an integer.
Thanks
0 Comments
Accepted Answer
More Answers (2)
Evan
on 18 Aug 2014
Edited: Evan
on 18 Aug 2014
i must be a real, positive integer. Because i starts at 1, and you reference A(i-1,2), your first iteration will try to access A(0,2), and 0 is not a proper matrix index under MATLAB's conventions.
To solve this, either adjust your indexing so that you access A(i+1,:) or change your range to i = 2:603+1
Guillaume
on 18 Aug 2014
As others have said, the issue is from A(i-1,2) that is not valid for i = 1.
There's a second issue that you are deleting rows as you are iterating over them so in all likelyhood, you'll hit an 'index exceeds matrix dimensions' before the end of the loop because you no longer have 603 rows.
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!