Clear Filters
Clear Filters

Noob problem: Defining a fumction and passing values issues an error "Subscript indices must either be real positive integers or logicals."

2 views (last 30 days)
I have the following function:
function [ result ] = SSD( i1, i2 )
if size(i1) == size(i2)
[r, c] = size(i1)
result = -(sum(sum((double(i1) - double(i2)).^2)) / (r*c));
result = 'invalid';
I would like to pass it to images that contain gray values only and the error:
Subscript indices must either be real positive integers or logicals.
Popes up. For debugging purpuse I tried calling the function in this way:
SSD(zeros(3), ones(3));
The error is still there. But if I call the function in this way:
SSD(ones(3), ones(3));
No error. What is happening? Why doesn't the function like zero values?

Accepted Answer

Jon on 21 Sep 2015
Runs fine on my machine-no errors. 2015a. Do you have a variable named SSD or zeros?
Kirby Fears
Kirby Fears on 21 Sep 2015
Try clearing your workspace before calling SSD.
SSD(zeros(3), ones(3));
If this works, you probably had a variable named zeros in your workspace.
Veselin Ivanov
Veselin Ivanov on 21 Sep 2015
Aaaa. Thanks :). I cleaned the workspace and now it worked. I have to get used to that old variables hang around :).

Sign in to comment.

More Answers (0)


Find more on Creating and Concatenating Matrices 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!